Scratched lenses can be a significant nuisance for glasses wearers, affecting not only the aesthetic appeal of the eyeglasses, but also the quality of vision. While it is easy for glasses to get scratched through everyday use, finding effective ways to remove these scratches can prove challenging. Ensuring proper care for glasses by using appropriate cleaning techniques and protective coatings can significantly reduce the likelihood of scratches. MaatOptical offers insight into best practices for cleaning and storing glasses to safeguard them from damage. ? ? It is also important to remain skeptical of quick fixes or household remedies, which can sometimes cause further damage to lenses. When home methods fail, seeking professional help from an optometrist or glasses specialist is the recommended course of action. Understanding Lens Materials and Scratches When it comes to eyewear, the material of the lenses and their susceptibility to scratches are critical. Lenses come in various materials, each with unique properties and levels of scratch resistance. Different Types of Lenses Glass Lenses: Historically, glass was the primary material used for eyeglass lenses. It's known for excellent clarity and scratch-resistance but is heavier and can shatter, posing a risk. Plastic Lenses: Lightweight and more impact-resistant than glass, plastic lenses are a popular choice. They, however, are more prone to scratches without a protective coating. Polycarbonate Lenses: Typically used in prescription glasses and sunglasses for their durability, polycarbonate lenses are even lighter and more impact-resistant than standard plastic lenses, making them a favored option for children's eyewear and safety glasses. Understanding Scratch-Resistant Coatings A scratch-resistant coating is a clear layer applied to lenses designed to protect them from everyday wear and tear. However, it's not entirely scratch-proof; it merely adds a layer of defense that prolongs the lens's life. This coating is particularly beneficial for plastic and polycarbonate lenses, which are softer and more susceptible to scratches compared to glass lenses. It's important for wearers to understand that despite its name, scratch-resistant does not mean scratch-immune and proper care is still required. ? ? DIY Scratch Removal Methods In the quest to repair scratched lenses, many turn to DIY solutions at home. While not all scratches can be removed, some superficial ones may be diminished with common household items. The Baking Soda Method A simple paste made from baking soda and water offers a DIY solution to treat light scratches on glasses. Mix one to two tablespoons of baking soda with just enough water to form a thick paste. Gently rub this onto the scratched lens in circular motions with a soft, clean cloth for about 10-20 seconds before rinsing with cool water and drying with a microfiber cloth. This method is most suitable for minor abrasions and should be approached with caution to avoid further scratching. The Toothpaste Technique For minuscule surface scratches, a dab of non-gel, non-abrasive, and non-whitening toothpaste can offer a DIY fix. Apply a small amount of the toothpaste to a cotton ball or soft cloth, and in a circular motion, gently buff the scratch for about 30 seconds. Rinse with cool water and repeat if necessary, keeping in mind to use sparingly to prevent additional damage. Using Metal Polish A home remedy for scratches that might not be suitable for scratch-resistant lenses involves using a small amount of mild metal polish. It's important to ascertain that metal polish used in this technique does not contain solvents that may harm lens coatings. Apply the polish to a soft cloth and work it into the scratch using a gentle side-to-side motion. After a brief buffing, remove any excess polish from the lens with a clean, damp cloth, followed by a dry microfiber cloth. This method should be employed sparingly as it can potentially remove lens coatings. Professional Repair and Replacement Options When scratches on glasses lenses are beyond the scope of DIY fixes, seeking professional help ensures accuracy and maintains lens integrity. Options range from minor repairs to full lens replacements, tailored to the condition of the glasses and the wearer's prescription needs. ? ? When to Visit an Optician or Optometrist An optician or optometrist should be consulted when scratches cause vision impairment or if there's uncertainty about the scratch’s depth. These professionals can assess the damage and recommend the best course of action, repair or replacement. If the glasses are under warranty or insurance, they might also facilitate a cost-effective solution. Lens Replacement Services Lens replacement services involve substituting scratched lenses with new ones that match the wearer's current prescription. This service is ideal for high-quality frames where the cost of replacement lenses is justified. Often, getting a new pair of glasses can seem tempting, but if the frames are still in good shape, replacing just the lenses can be a more economical and environmentally friendly choice. Opticians offer a range of lens options, including the latest advancements in coating and materials. Maintaining and Protecting Your Glasses Maintaining and protecting glasses goes beyond occasional cleaning. It involves consistent care to preserve the lenses' integrity and ensure the longevity of the frames. Proper cleaning and the use of protective accessories are central to this routine. Proper Cleaning Techniques To clean glasses effectively, one should gently wash the lenses with a mild dish soap to remove oils and residue. Water should be the solvent of choice, paired with a few drops of soap. It's important to use a microfiber cloth for drying and polishing to minimize scratches. Employing a circular motion can help avoid streaks and effectively clean the lenses without damaging any protective coatings like anti-glare or anti-reflective treatments. ? ? Using Protective Accessories After cleaning, glasses should be stored in a hard case to protect them from physical damage when not in use. When wearing glasses, one can consider accessories like a strap to prevent accidental falls. Lenses with UV protection are essential to shield the eyes from harmful ultraviolet rays. Regularly inspect and repair frames and replace them if they become too loose or tight, as an improper fit may lead to more frequent dropping and scratches.
Eye sensitivity to light, also known as photophobia, is a condition where eyes are overly reactive to sunlight or artificial light, causing discomfort or the urge to squint or close the eyes. Many individuals experience this as a symptom rather than a standalone issue. It can manifest due to various underlying health problems, ranging from minor conditions like dry eyes to more concerns including inflammation and neurological disorders. The reasons why some individuals have light-sensitive eyes can be varied. It may stem from a mild irritation or be indicative of more complex health issues affecting the brain or the structure of the eye. For example, those with lighter-colored eyes might experience increased light sensitivity because they have less pigment to protect against harsh lighting, while others could be responding to something more significant, like the onset of a migraine or the presence of a corneal abrasion. In investigating the causes of photophobia, it is important to note the accompanying symptoms that could lead to a proper diagnosis. Understanding the mechanisms behind this symptom will help individuals seek the right care and find relief. Understanding Photophobia ? ? Photophobia, commonly referred to as light sensitivity, is a condition characterized by discomfort or pain in the eyes induced by light. The following subsections delve into its definition, causes, and the physiological mechanisms that contribute to this sensitivity. Definition of Photophobia Photophobia is not, as its name might suggest, a fear of light, but rather an increased sensitivity to light that can cause discomfort or even pain. It is a symptom rather than a disease, signaling the presence of other conditions or sensitivities within the eyes or the nervous system. Common Causes A variety of factors can lead to photophobia, including: ●Eye disorders: Conditions such as uveitis, cataracts, or corneal abrasion. ●Neurological conditions: Migraines or subarachnoid hemorrhages can result in heightened light sensitivity. ●Infections: Meningitis or encephalitis affecting the brain and surrounding tissues. ●Medications: Certain pharmaceuticals, like antibiotics or diuretics, can induce photophobia. Physiology Behind Light Sensitivity The discomfort from photophobia arises when the light entering the eye leads to an overstimulation of the photoreceptor cells or an abnormal response in the optic nerve. This can be due to: ●Inflammation or damage to structures within the eye affects light processing. ●Neurological disruptions alter the brain's perception of light intensity. Medical Conditions Associated with Photophobia ? ? Photophobia, or light sensitivity, can be a symptom of various medical conditions. It often accompanies disorders that affect the brain, eyes, or even genetic makeup. Migraine Headaches Individuals with migraine headaches may report severe sensitivity to light. During a migraine episode, light can exacerbate the pain, prompting many to seek relief in darkened rooms. Eye Diseases Various eye diseases can contribute to increased light sensitivity. For example, conditions like corneal abrasion, uveitis, and cataracts impact the eye's ability to manage light properly, often leading to photophobia. Neurological Disorders Photophobia may also be associated with certain neurological disorders, such as meningitis or concussion. ? These conditions can alter the way the brain processes light input, leading to discomfort in bright environments. Genetic Factors Some individuals may have inherited tendencies that make them more susceptible to light sensitivity. Genetic factors can determine how the eyes respond to light, potentially leading to a higher prevalence of photophobia in some families. Environmental and Lifestyle Factors ? ? Lifestyle choices and environmental conditions can significantly contribute to light sensitivity. Understanding these factors may help individuals manage and mitigate their symptoms effectively. Exposure to Bright Lights Individuals frequently exposed to intense lighting, such as sunlight or artificial lights, may develop a heightened sensitivity to light. Wearing sunglasses or hats with brims when outdoors can offer protection and reduce discomfort. Digital Screen Use The blue light emitted by digital screens can strain the eyes and lead to photophobia, especially after prolonged use. Implementing the 20-20-20 rule, where every 20 minutes, a person looks at something 20 feet away for 20 seconds, can help alleviate eye strain. Diet and Nutritional Deficiencies A diet lacking in essential nutrients may affect eye health and contribute to light sensitivity. Ensuring a balanced diet with vitamins A and E, as found in leafy greens and nuts, is vital for maintaining eye function. Diagnosis and Evaluation ? ? When a patient presents with increased light sensitivity, also known as photophobia, healthcare providers embark on a systematic approach to diagnose the underlying cause. This involves detailed symptom assessment, comprehensive eye examinations, and potentially neurological tests. Symptom Assessment The first step in evaluating light sensitivity is to characterize the symptoms thoroughly. Patients are asked to describe the severity of their photophobia, its impact on daily activities, and any accompanying symptoms such as eye pain or headache. They should also report on any history of eye problems or systemic diseases that could contribute to sensitivity to light. Eye Examinations Following symptom assessment, various eye examinations are conducted to identify possible ocular causes. ? These may include: ●Visual Acuity Test: To check for vision impairment. ●Slit Lamp Examination: For an in-depth view of the eye's structures, revealing conditions like conjunctivitis or corneal abrasions. ●Dilated Pupil Exam: To examine the back of the eye, assessing for retinal or optic nerve issues. A comprehensive eye exam helps in pinpointing the exact issue that could be leading to light sensitivity. Neurological Tests If the eye examinations do not reveal the cause, or if there is a suspicion of neurological involvement, healthcare providers may order specific tests. These can include: ●Brain Imaging (MRI or CT scans): To detect abnormalities within the brain that may explain symptoms. ●Neurological Examination: To assess for disorders that might affect light perception pathways, encompassing brain and nervous system functions. Treatment Options When addressing light sensitivity, or photophobia, various treatments can alleviate symptoms. These range from medications to protective eyewear, and even specialized therapeutic techniques. Medications and Supplements Individuals experiencing sensitivity to light may benefit from specific medications or supplements. Depending on the underlying cause of photophobia, doctors might prescribe: ●Anti-inflammatory medications: to reduce pain and inflammation. ●Antihistamines or mast cell stabilizers: for photophobia associated with allergies. In some cases, nutritional supplements might also support eye health and reduce sensitivity. Eye Protection Methods Protecting the eyes from harsh light can offer immediate relief. Practical methods include: ●Sunglasses: Especially those with polarized or photochromic lenses. ●Hats with brims: to shade the eyes from direct sunlight. Utilizing specialty eyewear with tinted lenses that filter certain wavelengths of light can also be beneficial for indoor and outdoor use. Therapeutic Practices Beyond medications and protective methods, certain therapeutic practices can help in managing light sensitivity: ●Vision therapy: Individualized programs designed to improve visual abilities. Consistently following these therapies may reduce the overall impact of photophobia on daily life. Among the brands producing photochromic lenses to protect your eyes, Maat Optical can be considered one of the best. Our line of photochromic sunglasses has been designed to satisfy all your needs in a perfect pair of eyeglasses, such as comfort, optimum vision, and protection throughout the day.?
Understanding the 'axis' component in a glasses prescription is essential for individuals with astigmatism, a common refractive error causing blurred vision.? The term 'axis' refers to the orientation, in degrees, of the cylindrical correction required to correct this irregular curvature of the eye's lens or cornea.? This value, ranging between 1 and 180 degrees, specifies the direction of the astigmatism and is critical in crafting lenses that provide clear vision. ? ? In a prescription, the 'axis' is a crucial number that comes into play only when there is a 'cylinder' (CYL) value present, which means the individual has astigmatism. It informs the lens manufacturer of the exact orientation where the correction is needed.? Without an accurate 'axis' value, the cylindrical correction would not be aligned correctly, leading to suboptimal vision correction and potential discomfort for the wearer. The precision of the 'axis' measurement is paramount; even a slight deviation can cause significant issues in how effectively the eyeglasses correct vision.? Eye care professionals determine this measurement during an eye examination, and it's one of the critical pieces of information that ensures eyeglasses are tailored to an individual's unique visual needs.? Understanding Axis in Eyeglasses Prescription In an eyeglasses prescription, the axis is a critical value representing the orientation of astigmatism correction. It ensures that lenses are precisely crafted to improve vision. Defining Axis and Its Role in Vision Correction The axis denotes a specific angle in degrees ranging from 1 to 180 and pertains to the orientation of cylindrical power in the lens needed to correct astigmatism. This refractive error occurs when the eye has an irregular shape, causing blurred vision. The axis number precisely aligns the cylinder component of the lens, ensuring that light properly focuses on the retina. The Relationship Between Axis, Cylinder, and Astigmatism When correcting for astigmatism in a glasses prescription, cylinder (CYL) and axis work in tandem. The cylinder value specifies the lens power measured in diopters, needed to correct the blurry vision due to astigmatism. The axis indicates the position of the cylinder power, corresponding to the meridians of the eye that require correction. If an individual is nearsighted or farsighted, the axis ensures the cylindrical lens counteracts the uneven curvature of the eye’s surface. ? ? Interpreting Your Glasses Prescription When reading an eyeglasses prescription, understanding each term and abbreviation is crucial to get the correct lenses for your vision needs. This section will guide you through common abbreviations and terms, explain how proper fitting is achieved, and outline the process of obtaining corrective eyewear. Breaking Down Prescription Abbreviations and Terms OS and OD are Latin abbreviations where OS stands for "Oculus Sinister" (left eye) and OD means "Oculus Dexter" (right eye). Sometimes you'll see OU, which means something pertains to both eyes. SPH, or sphere, indicates the lens power, measured in diopters (D), required for vision correction; a minus sign (-) signifies correction for nearsightedness (myopia), while a plus sign (+) suggests farsightedness correction (hyperopia). For those with an irregularly shaped cornea or lens, astigmatism correction is represented by cylinder (CYL) and axis, which is the lens meridian that piggybacks the CYL value to correct the misalignment. ? ADD represents additional magnifying power needed for presbyopia, common in bifocals or progressive lenses. Proper Fitting and Measurement for Optimal Eyeglass Performance ? ? Accurate measurements are essential for fitting eyeglasses correctly. Pupillary Distance (PD) is the measurement between the centers of your pupils and impacts how well your lenses center on your eyes. This, along with fitting measurements like lens diameter, ensures that multifocal lenses provide the intended visual acuity. Opticians also measure for prism correction to alleviate double vision (diplopia) often caused by eye alignment problems like strabismus. ? From Prescription to Corrective Eyewear: The Process After receiving a prescription from an eye doctor, an optometrist or an optician will help you choose the right lens and frames. Sunglasses, photochromic lenses, and anti-reflective coating are additional options they may discuss with you.? Bifocals, multifocal lenses, and progressive lenses cater to complex vision needs like presbyopia and myopia simultaneously.? The manufacturing process for the lenses adheres to the specifications of your prescription, factoring in the axis for astigmatism and additional lens corrections needed.? Once crafted, your eyewear undergoes a final fitting to ensure comfort and effectiveness. Maat Optical has over 20 years of experience dedicated to satisfying the photochromic lens needs of all our customers and distributors. Photochromic lenses produced at Maat Optical have faster responsiveness, get dark up to CAT-3 levels, stability and consistency in all colors and a long lifespan.
Photochromic lenses have gained popularity as a convenient and practical solution for those seeking eyewear that adapts to different lighting conditions. These lenses automatically adjust their tint levels in response to the intensity of ultraviolet (UV) light, providing clear vision indoors and darkening outdoors to protect the eyes from glare and harmful UV rays. As with any technology, photochromic lenses come with their own set of advantages and drawbacks, making it essential to weigh the pros and cons before determining if they are the right choice for your eyewear needs. ? The convenience of photochromic lenses is a significant advantage for people who frequently transition between indoor and outdoor environments. With the ability to adjust their tint levels automatically, these lenses eliminate the need for multiple pairs of prescription glasses, saving both time and money. However, certain drawbacks need to be considered before committing to photochromic lenses. ? Pros of Photochromic Lenses Convenience and Versatility One of the main reasons people choose photochromic lenses is for their convenience and versatility. These adaptive lenses automatically adjust to the level of light, providing clear vision in all conditions. This eliminates the need for multiple pairs of eyeglasses or the hassle of switching between prescription eyeglasses and sunglasses when going from indoors to outdoors and vice versa. For those who require prescription lenses, photochromic lenses offer a simple all-in-one solution. ? UV Protection In addition to their convenience, photochromic lenses also provide excellent protection against harmful UV rays. The MaatOptical brand?of photochromic lenses blocks of UVA and UVB rays, shielding your eyes from the potential dangers of long-term exposure to sunlight. This level of protection can help reduce the risk of eye conditions such as cataracts and macular degeneration. ? Eye Health Benefits Apart from UV protection, photochromic lenses offer various other eye health benefits. They provide visual comfort by automatically adjusting their tint according to the surrounding light conditions. This reduces eye strain and fatigue, making daily activities more comfortable. The adaptive nature of photochromic lenses also ensures improved vision in low-light conditions. Moreover, Maat's photochromic lenses offer the option to include blue light protection based on personal preference. By shielding eyes from excessive blue light exposure, photochromic lenses can further contribute to overall eye health and comfort. Photochromic lenses offer numerous benefits including: ●?Convenience: No need to switch between prescription eyeglasses and sunglasses. ●?Versatility: Suitable for both indoors and outdoors use. ●?UV Protection: Blocks of UVA and UVB rays. ●?Eye Health Benefits: Reduces eye strain, fatigue, and blue light exposure. ? Cons of Photochromic Lenses ? Performance in Vehicles One drawback of photochromic lenses is their performance in vehicles. They typically do not darken as much in a car since the vehicle's windows filter out UV rays，but they can filter out UV rays that car windows may miss and eliminate the need to switch glasses when leaving the vehicle. ? Adaptation to Changing Light Conditions Photochromic lenses can sometimes take some time to adjust to changing light conditions. They generally darken in bright light and lighten in low light environments, which can be a great benefit. However, they may not always adapt quickly enough when transitioning from bright sunlight to shade, or vice versa. This slow response time could be inconvenient for wearers, especially in situations where the light conditions change rapidly, such as when stepping indoors from bright sunshine. Cold weather can also slow down the darkening process, making them less ideal for winter sports enthusiasts. For this purpose, Maat Optical lenses?with faster responsiveness are specifically designed to address this issue. Photochromic lenses remain clear indoors, while get dark outdoors when exposed to UV light present in sunlight. The major factor of the magic is the photochromic dyes in the lens or on the surface of the lens. After decades of R&D and improvement, Maat has made breakthrough achievements in its self-developed and improved dyes: 1. Faster responsiveness 2. Darkness up to CAT-3 level 3. Stability and consistency in all optional colors 4. Long-service life Maat Optical Super Darker & Faster Collection boasts remarkable statistics: Changing Speed +18.5%, Fading Speed +26%, Darkness +29.8%. Experience the Jelly Series for vibrant, optional colors, elevating your sense of fashion. Cost Considerations Finally, the cost of photochromic lenses may be a significant factor to consider when weighing the pros and cons. In conclusion, while photochromic lenses offer some advantages in terms of convenience and eye protection, they do have certain limitations. Consider factors such as performance in vehicles, adaptability to changing light conditions, and cost when deciding if these lenses are the right choice for you. ? Photochromic Lens Technologies ? Advancements in Photochromic Tech Maat currently adopts two kinds of production processes to meet the needs of different consumer groups. In-mass photochromic originally was developed by Corning in the 1960s and applied to glass materials, nowadays it is widely used in resin lens production. The principle is mixing photochromic dyes with lens monomer, the biggest advantage is a stable photochromic performance at a lower price, the bands are only mid-index available, and lower responsive speed(both darkening and fading time). CB layer coating photochromic, also named spin-photo, is considered to be the most advanced photochromic lens production technology nowadays. Advantages: faster color changing speeding and fading speed, more optional indexes andflexible function selection. Disadvantage: higher price. Progress in photochromic technologies ensures that users can enjoy the benefits of these versatile lenses without compromise. As technology continues to evolve, photochromic lenses will likely become even more effective and tailored to specific needs. ? Choosing the Right Photochromic Lense ? Lens Materials and Tints When selecting photochromic lenses, consider the lens material and tints. Common materials include glass lenses, polycarbonate, and high-index?plastics, each with varying levels of UV and impact resistance, weight, and optical clarity. Consult an eye care professional to determine which material is right for your personal needs and prescription lenses requirements. Lens colors also play a role in defining the performance of photochromic lenses. Some lens colors, like gray or brown, provide more accurate color vision, while others offer more contrast. Consider your lifestyle and daily activities to choose the most suitable lens color for your needs. ? Lens Coatings and Features Photochromic lenses can come with various coatings and features that provide additional benefits. An anti-reflective coating?reduces glare and enhances visual comfort, especially in low light or night-time activities. A blue light filter?reduces exposure to harmful blue light emitted by digital devices and may help prevent digital eye strain. When opting for photochromic lenses, ensure these additional features align with your personal needs. For example, you may prioritize blue light protection if you spend a significant time in front of computer screens. ? Personal Optical Needs Lastly, consider your personal optical needs, including myopia, hyperopia, and reading requirements. If you need separate prescriptions for distance and reading, you may opt for bifocals?or progressive lenses?with photochromic features. If you have specific requirements for your frames or considering contact lenses, be sure to consult an eye doctor about the compatibility of photochromic technology with these options. By evaluating lens materials, coatings, features, and personal optical requirements, you can make an informed decision on choosing the right photochromic lenses tailored to your needs and lifestyle. ? Frequently Asked Questions ? Are Photochromic Lenses Suitable for All Ages? Photochromic lenses are a versatile choice that can benefit people of all ages. They automatically adjust to various lighting conditions, providing comfort and convenience for both children and adults. Seniors may also find them helpful, as their eyes become more sensitive to light with age. However, some individuals might prefer traditional prescription sunglasses, while others might not need the added convenience of light-changing lenses, so it ultimately depends on one's specific needs and preferences. ? How Long Do Photochromic Lenses Last? The lifespan of photochromic lenses can vary based on several factors, including the brand, lens material, and how well they are cared for. Generally, you can expect photochromic lenses to last about 2-3 years?before they begin to lose their effectiveness in adapting to different light conditions. Additionally, exposure to extreme temperatures and frequent changes between indoor and outdoor environments can affect lens performance over time. To prolong the life of your photochromic lenses, follow proper care instructions, such as cleaning them regularly with a gentle solution and keeping them in a protective case when not in use. ? What are the benefits of using photochromic lenses in everyday eyewear? Photochromic lenses offer convenience by adjusting to different light conditions automatically. They protect your eyes from harmful UV rays and provide comfort by reducing eye strain in bright sunlight. Since they transition from clear to dark and back again, you won't need to carry a separate pair of sunglasses. ? Can photochromic lenses replace the need for separate prescription sunglasses? In many instances, photochromic lenses can replace the need for separate prescription sunglasses. They provide the versatility of having both clear glasses and sunglasses in one pair. However, some people may still prefer having dedicated sunglasses for specific purposes like outdoor sports or high-glare environments. ? Are there any specific situations where photochromic lenses may not perform optimally? Photochromic lenses may not perform optimally in certain situations, such as inside a vehicle. Car windshields typically filter out UV light, which may not trigger the lenses to darken. Extremely hot or cold temperatures can also affect their responsiveness. Additionally, some people with specific eye conditions might not benefit as much from the adaptive features of photochromic lenses.
Meta Description: Photochromic lenses don't get dark when used in cars due to the windshield technology. This post explains all you need to know about car windshield technology and your photochromic lens. ? Do Photochromic Lenses Work In A Car? ? Most Photochromic lenses do not darken inside cars. Therefore the simple answer is no. However, there are some exceptions that will be discussed later in this article. In order to understand why your photochromic lenses do not darken inside your car, we will start by explaining what a photochromic treatment does to your lenses. Photochromic lenses are made up of particles sensitive to ultraviolet rays, therefore, they darken or lighten depending on the amount of UV rays your lenses absorb. Thus; If you are in a closed space or with artificial light, your glasses will have “clear” lenses; if you go outside and are exposed to the Sun, they will darken to a deep hue in a short period of time. That said, photochromic lenses are not entirely recommended for driving since the windshields of most cars for a couple of years now have a UV light filter integrated from the factory to reduce glare for drivers on the road. ? How photochromic Glasses work in the Car Your windshield is normally very different from the rest of your glass, in that it is two laminated panes with a layer of plastic that contains UV light inhibitors that protect the plastic and therefore also prevent UV light transmission. A laminated glass windshield typically blocks 98 to 99% of all UV rays. Ultraviolet light operates under the visible spectrum and is invisible to the human eye. Its presence and effect have nothing to do with the luminosity of the sun; This is why you can still get sunburned if you go to bed on a cloudy day. This sometimes leads to confusion about the effectiveness of transition lenses and fuels questions such as; "If bright sunlight shines into my car, why don't my photochromic lenses darken? Are they defective? " ? No, your photochromic lenses work very well. They simply cannot react to a light source that is not present, and in a vehicle, most of that UV light has already been taken out of the equation. Additionally, the lenses transmit light at about 83% when indoors (without anti-reflective coating). ? ? ‘My Photochromic Lenses sometimes darken in the car and sometimes do not’ You may notice your lenses darkening in your car. This is because, in typical automotive vehicles, only the windshield blocks a high percentage of ultraviolet rays. Side and rear windows are rarely laminated. Therefore, although they have some anti-UV properties, they also allow a good portion of ultraviolet light to escape. And, of course, open windows allow certain amounts of ultraviolet light to filter in which can make your transition lenses react. ? How do I Use Photochromic Lenses while Driving ? Photochromic lenses are considered useless when driving during the day. This is because it doesn’t serve its purpose of blocking UV rays when inside the car as the windshield already does that.? Therefore, If your prescription photochromic lenses don't darken enough for your comfort level in the car, you have options. You can purchase a pair of prescription sunglasses for driving. You can also purchase clip-on sunglasses to temporarily attach to your prescription glasses. ? How Can Photochromic Lenses Be Beneficial For Driving? If your windshield is defective or broken, it can impair its ability to block most UV rays from getting to your eyes. ? ?Therefore, you can use a photochromic lens in the meantime before you find a solution to your windshield. It’s not advisable to drive around with a defective windshield just because you have a photochromic lens though as there are other concerns. Photochromic lenses can also be beneficial if you love driving with your windows down. This can help prevent the adverse effects of UV rays when you look outside through your car window. Lastly, most people don’t know the amount of UV rays escaping through their windshield. Therefore, a photochromic lens can still be worn just in case. Photochromic lenses can also help to block blue light while driving, especially lenses produced by Maat Optical. ? In Conclusion ? ? Photochromic lenses have limited use when driving and may even be totally not needed. However, they can be used in some few conditions and can even be very beneficial in other situations. Therefore, the decision to use a photochromic lens while driving is an individual decision.? If you would like a photochromic lens that works behind the wheel, consult Maat Optical. We have over 20 years of experience dedicated to satisfying the photochromic lens needs of all our customers. Photochromic lenses produced at Maat Optical have faster responsiveness, get dark up to CAT-3 levels, stability and consistency in all colors and a long lifespan. ? ? FAQS ? Are Photochromic Lenses Good For The Eyes? Photochromic lenses adapt to changing light, reduce glare and limit UV exposure, making them a great choice for eye protection. ? How Do Photochromic Lenses Work? Photochromic lenses contain special molecules called organic photochromic dyes. When exposed to ultraviolet (UV) light, these molecules undergo a chemical reaction, causing a change in the lens color. In the absence of UV light, the molecules are transparent. Upon UV exposure, they undergo a structural change, absorbing certain spectra and darkening the lens color. As light diminishes or UV light is no longer present, the molecules revert to their original state, gradually returning the lens to a transparent condition. This automatic adjustment feature allows photochromic lenses to provide appropriate sun protection under varying light conditions, offering comprehensive eye care. ?
Do photochromic lenses filter blue light? The simple answer to this is yes.? Photochromic lenses are not designed for this purpose as they are designed to darken on exposure to sunlight and prevent your eyes from the harmful effect of Ultraviolet light. Most people buy Photochromic lenses because they don't want to continually switch between clear glasses and sunglasses when they move from indoors to bright sunlight. ? ? However, photochromic lenses also protect our eyes from the blue light from the sun as well as our digital devices thus preventing digital eye strain, mid-afternoon fatigue, headaches, and trouble sleeping. This may eliminate the need for further prescription glasses in some cases. ? Crazy right? Let's dive right into the fine details. ? What Are Blue Light Filter Lenses? If you are familiar with glasses and their treatment or you were one you have probably heard of ‘blue light filter.’ However, you may be wondering what they are.? It is important to talk about the types of blue light before we discuss blue light filtering. There are two types of blue light which are: Blue light – turquoise: This is the type of blue light that is emitted from the sun and can even be beneficial for health, especially regulating the circadian rhythm. This is because it helps regulate our “biological clock” by suppressing the production of melatonin and influencing the production of serotonin, which promotes that feeling of well-being, and also the production of vitamin D in our body. Blue-violet light: ? On the other hand, blue-violet light is considered harmful to eye health, especially with prolonged exposure. It is usually emitted by artificial lights in our immediate surroundings as well as digital devices with screens. ? To prevent blue-violet light, which is harmful to the eye, lenses with a blue light filter are treated with a protective coating that can be used in prescription eyeglasses and sunglasses.? It is important to note that only turquoise blue light—which is generally beneficial to body and visual health—is allowed to pass through this protection. ? Do Photochromic Lenses Block Light From Your Screens? ? ? Even though blue light and ultraviolet light rays aren't the same thing, blue light is just a level below UV rays on the light spectrum and thus can still be harmful to the eyes, especially with prolonged exposure to digital screens and direct sunlight. ?Any invisible and partially visible light can have side effects that are harmful to your eye health. ? While UV exposure can be avoided by staying inside or forgoing tanning beds, blue light is practically everywhere digital devices thrive. Our eyes are daily exposed to blue lights from Smartphones, Laptops, Tablets, Smart TVs, and much more. ? Although photochromic lenses were designed for a different purpose, they do indeed have blue light-filtering capabilities. ? ?Photochromic lenses generally provide protection against the highest energy level on the light spectrum (UV rays). While UV light and blue light are not the same thing, high-energy blue-violet light is next to UV light on the electromagnetic spectrum.? This means that photochromic lenses can also protect against blue light and are excellent for computer use or use with other blue light-exposing digital devices. ? Side Effects Of Blue Light Blue light, emitted by the digital screens we use every day, not only causes eye strain which can lead to headaches and blurred vision but can also disrupt our sleep cycle according to studies. ? While blue light in small amounts may have positive effects, like helping you sleep better, most people don't moderate their screen time and therefore are at risk of side effects if prolonged exposure to blue light. ? ? Here is a complete list of blue light side effects: ? ? ●Macular degeneration: Blue light can cause retinal damage, which has been linked to macular degeneration, especially age-related macular degeneration.. ? ? ●Dry eyes: When you look at digital screens, which emit a lot of blue light, you blink less often (and even less if you wear contact lenses), which leads to insufficient moisture production in your eyes.? ? ? ●Digital Eye Strain: Constant exposure to blue light can cause fatigue in your ciliary and extraocular muscles. ? ? ●Blurred vision: When your ciliary and extraocular muscles weaken, your vision can become blurry. Relaxation of these muscles is a side effect of digital eye strain, caused by blue light. ? ? ●Cataracts: You may have heard that sun exposure can lead to cataracts, but blue light also produces the same cells responsible for this debilitating eye condition. ?This is with prolonged exposure to blue light over the years without any protective eyewear.? ? ? ●Headaches: Straining to see when your eyes are tired and your vision is blurry can also cause headaches. ? ? ●Insomnia: Do you take a long time to fall asleep after looking at your phone in bed for an extended period of time? Blue light may be responsible for your difficulty falling asleep. ? ? ●Restless sleep: Even if you fall asleep fairly quickly, blue light can deprive you of the vital rest that sleep should provide you. ? ? Should I Get Photochromic Lenses? While exposure to blue light (turquoise) is important for keeping our wellbeing, alertness, and cognitive performance during the day, chronic exposure to low‐intensity blue light directly before bedtime, may have serious implications on our circadian phase and sleep quality.? This raises inevitably the need for solutions to improve well-being, alertness, and cognitive performance in today's modern society where exposure to blue light-emitting devices is ever-increasing. Photochromic lenses have many benefits, particularly because they function as both glasses and sunglasses as they darken when exposed to ultraviolet light from the sun and protect against UV ?rays In addition, we have shown that photochromic lenses filter blue light from digital screens and sunlight.? By reducing the effects of glare and protecting your eyes from harmful overexposure to blue light, photochromic glasses can contribute to a more comfortable user experience. ? ? Do you want a reliable photochromic lens partner? ?Maat Optical has been dedicated to the art of producing photochromic lenses for more than 20 years and they are ready to satisfy all your wholesale photochromic lens needs. ?
The word ‘photochromic’ is coined from two Greek words: photos, meaning light and chroma, meaning color. Therefore, we can deduce that photochromic glasses can change their color when exposed to light. This is a very simplified definition of what photochromic sunglasses can do. This article explains what photochromic glasses are, how they work, and what materials are used in their production. ? ? What are Photochromic Glass Lenses and Sunglasses? ? First developed in the 1960s by the Corning Glass Works factory, photochromic glass lenses are coated with chemicals which make them darker when exposed to bright light and clear when in normal light. These lenses are called several names, including ‘light intelligent’ and ‘variable tint’ lenses. Photochromic lenses not only block light, but they also protect the eyes and their surrounding tissues from UVA and UVB rays. Photochromic eyewear comes in several forms, including contact lenses, prescribed eyeglasses, and sunglasses. Our focus here will be on photochromic sunglasses. Photochromic sunglasses are not as clear indoors as other photochromic eyepieces but get darker in the sun, blocking more light. ? How Photochromic Sunglasses Work ? A photochromic lens is usually coated or infused with organic and inorganic chemicals such as silver halide, pyrido-benzoxazines, and silver chloride. The molecules of these chemicals have a certain arrangement when under normal lighting conditions. When exposed to UV rays from the sun, these molecules move, rearrange themselves, absorb light, and the lens becomes darker as a result. Although photochromic sunglasses mainly shield our eyes from very strong light, most are sensitive to ultraviolet rays and not visible light. That is why most lenses typically do not darken inside a vehicle because the windshield only lets in visible light while blocking most UV rays. However, newer technology allows some lenses, like those used in Maat Optical sunglasses, to activate with visible and ultraviolet light. Recent advances in technology allow the addition of dyes to the coating materials, which lets you tint the eyeglasses according to your preferences. Photochromic lenses usually take around 30 seconds to darken when exposed to the sun and stay dark unless you move away from the bright area. It takes longer for the sunglasses to return to normal, typically around 2-5 minutes after leaving the sun. Environmental factors, such as temperature, can affect the time the lens takes to return to normal. ? ? Types of Photochromic Lenses ? Photochromic lenses were originally made with glass. However, the increased availability of other materials like resin or plastic has made the creation of sunglasses with other materials possible. Materials like plastics and resins are sometimes preferred to glass because they are more flexible and lighter in weight. Maat Optical sunglasses use glass and other high-quality materials so that you can make your choice based on your preferences. Glass Photochromic Lenses These are the original photochromic lenses. They use glass lenses coated with a photochromic chemical such as silver halide or silver chloride. Glass lenses are generally thinner and more attractive than plastic lenses because of their higher refracting indexes. However, they may be prone to producing glares. Glass lenses are more scratch-resistant than lens materials like plastics. The major disadvantage of glass lenses is their brittleness, which decreases their durability. Also, glass lenses have a limited option of frames compared to other materials. Plastic Photochromic Lenses ? Plastic photochromic lenses use carbon-based compounds called photochromic dyes. When exposed to ultraviolet light, these compounds change their structure to darken the lens. These compounds, such as pyrido-benzoxazines, react more quickly to UV light than those used in glass lenses. Plastic lenses are lighter than glass lenses, so they are more comfortable to wear and won’t slide down your nose easily. Plastic lenses are less prone to glare, more flexible and durable, and compatible with a wide range of frames. However, they are more prone to scratches and are usually thicker and less attractive than glass lenses. Tinted Photochromic Lenses ? The photochromic dyes used in plastic lenses can produce different colors or tints in sunglasses using plastic lenses. This gives you the flexibility to choose any color you like. The lenses can also be coated with an extra reflective compound, which offers more protection from UVA and UVB rays from the sun. ? ? Benefits of Photochromic Sunglasses ? UV Protection A lifetime exposure to UV radiation and sunlight has long been associated with cataracts in older people.? ? Photochromic sunglasses can effectively prevent up to of these harmful rays from reaching the eye. Reduced Eye Strain? By reducing the amount of light getting to the eyes, these sunglasses help reduce eye strain from bright sunlight. This leads to increased visual comfort when you’re outdoors. Convenience A photochromic sunglass is essentially two glasses in one: a pair of sunglasses in the sun and a normal pair of glasses in normal light. With these glasses, you need not worry about your itinerary because they work well indoors and outdoors. Cost-Effectiveness With photochromic glasses, you essentially get two pairs of glasses at a much lower price. ? Disadvantages of Photochromic Lenses ? Slower Response Time Photochromic glasses take some time to adapt to new lighting conditions. It can be faster to whip out a suitable pair of glasses instead. Higher Cost Photochromic sunglasses cost more than conventional sunglasses. However, they cost less than getting two pairs of eyeglasses. Temperature Sensitivity The change in the molecules’ positions is a chemical reaction affected by ambient temperature. Cold or hot temperatures can make the lens transition more slowly than normal. Not Safe for Driving Photochromic sunglasses get darker when they come in contact with sunlight. Therefore, they should not be used while driving. ? ? Conclusion Among the brands producing photochromic lenses, Maat Optical can be considered one of the best. Our line of photochromic sunglasses has been designed to satisfy all your needs in a perfect pair of eyeglasses, such as comfort, optimum vision, and protection throughout the day.
If you are not new to using glasses then you are probably familiar with photochromic lenses. They are designed to change their characteristics (color) to changing light conditions such as bright outdoor sunlight or lighter indoors. ? ? ? This singular characteristic makes them a top choice for people who do not want to switch between different pairs of glasses in changing light conditions.? However, if you are new to glasses and stumbled on photochromic lenses you may be wondering if your glasses are made with photochromic lenses or not. In this blog, we'll explore different ways to activate the photochromic reaction that distinguishes photochromic lenses from other lenses. ? What Triggers photochromic Glasses? The molecules that make up a photochromic lens (Photochromic lenses) are triggered when they are exposed to UV light and this is what causes them to darken. The amount of UV light needed to trigger this change depends on the type of Lens that is being used however they all generally start to darken when exposed to sunlight (even when the sun is stuck behind a stubborn cloud) ? How do I know If My Glasses are Photochromic?? You’ve got new glasses but you aren't sure if they are photochromic glasses. There are a few tricks to confirm if your glasses are photochromic or not. All you need to do is set up different lighting conditions that can trigger photochemical reactions seen in photochromic lenses.? Here are a few things to do to activate a photochromic lens. If your glasses darken under these conditions, you are likely to have photochromic glasses in your hands. ? Go Outdoor in the Open The easiest way to activate a photochromic glass is to go outside on a sunny day because photochromic lenses are activated by UV lights and they are abundant in sunlight.? A photochromic lens will start to darken the second they are exposed to the sun on a bright day. However, note that this test may be negative if done in a car. photochromic lenses don't work well in cars generally because the windshield of the car blocks a significant amount of UV rays from the sun.? Use a UV Flashlight ? ? Perhaps it is not so sunny where you stay and you can't wait for the sun to come out to confirm the type of lens you use. You can simply get a UV flashlight to activate your photochromic lens.? You can easily get a UV flashlight from your local hardware store or an online store that delivers fast. If your lenses darken when you expose them to the beam from your flashlight, you definitely own a pair of photochromic glasses. ? Use a UV lamp A good alternative if you can’t get a UV flashlight is to use a UV lamp. And, no, UV lamps don't look anything like UV flashlights.? UV lamps are often used in tanning beds and can emit enough UV light to activate your lenses and confirm if they are photochromic. However, be careful not to expose yourself to too much UV rays as they can be harmful to your skin. ? Don't Conclude too quickly.? Don't be quick to judge if your lenses don't darken quickly when exposed to UV lights.? A good-quality photochromic lens can darken in a few seconds. However, most photochromic lenses take about 30-60 seconds to darken when exposed to ultraviolet light. They can even take up to a few minutes depending on the brand and the photochromic molecules in your photochromic lenses. ?Similarly, when you go back indoors, the lenses will gradually lighten up. ? If any of this doesn't work, no need to fret you can order a pair of Photochromic glasses from Maat Optical. ? What Are Some Common Misconceptions About photochromic Lenses? ? ? There are a few common misconceptions about photochromic lenses that we'd like to clear up: ? Do Photochromic lenses work inside the car? Yes, but much of the ultraviolet radiation that activates the photosensitive lenses is absorbed by the windshield, and they are not as dark inside the car as they would be outside. However, some newer cars have windshields that allow more UV light to pass through, which can activate the lenses. Although Photochromic lenses provide some degree of protection from in-car glare, some users may prefer a pair of sunglasses for long-term driving. ? Do Photochromic lenses replace conventional sunglasses? For general use - whether indoors, outdoors, day or night - Photochromic lenses offer excellent visual performance and glare protection. However, in intense sunlight, in high-temperature environments, inside automobiles with windshields that block most ultraviolet radiation, or in environments with intense reflections from surfaces such as water and snow, a unique pair of glasses made under prescription with a fixed shade will offer better protection against glare and more visual comfort. ? They don't work in cold temperatures Some people believe that photochromic lenses won't darken in cold temperatures. While it's true that extreme cold can affect the lenses' performance, they should still darken in most normal temperature conditions. ? Photochromic Lenses are always Dark Photochromic lenses are not always dark as some people believe. Photochromic lenses are designed to adjust to changing light conditions, so they won't always get very dark. The amount of darkening depends on the amount of UV light present. If you're in an area with low UV light, your lenses won't get as dark as they would in bright sunlight. ? ? Final Words Now you know how to differentiate a photochromic lens from a non-photochromic lens. If you found out your lenses are photochromic, great, now you have a stylish and practical two-in-one solution for people who don't want to carry around multiple pairs of glasses.? However, if you found out your glasses are clear glasses and you want photochromic glasses, Maat Optical has been dedicated to the art of producing photochromic lenses for more than 20 years and they are ready to satisfy all your photochromic lens needs.
The transitioning that a Photochromic lens undergoes when exposed to sunlight (or Ultraviolet Light in general) can seem like magic. ?One second you are indoors with your clear glasses, the next moment you are outside and have sunglasses-like shades on your face without changing frames.? It is a quite fascinating phenomenon and it has left many wondering the exact magic trick behind this rapid change in color density.? This guide carefully explains the science behind the change in color a photochromic lens undergoes when exposed to sunlight as well as their many benefits. ? What Are Photochromic Lenses? A Photochromic lens is a lens that stays clear indoors away from light and darkens upon exposure to ultraviolet light from the sun. They serve a dual function of both glasses and sunglasses.? The first photochromic lenses were made from glass and were patented in the 1960s. Over time, plastic lenses were developed in the 80’s and 90’s and are now the go-to and popular choice among modern users. ? How Do Photochromic Lenses Work? Photochromic lenses contain light-sensitive molecules that shift their structures when they are exposed to UV rays from the sun. This change in structure allows them to be able to absorb more light and concurrently give the lenses a darkened appearance. ? ? Once the light source is taken away, the structures shift back to their initial conformation, and the process is reversed thereby giving the lens a clear appearance again.? These molecules are sensitive to the presence of UV light and the amount of UV rays passing through them. This means that their structural change is faster in the presence of more UV light and this change is slow when they are exposed to a minimal quantity of ultraviolet rays.? This explains why your photochromic lens may not darken as much when you are in a shade as opposed to being directly hit by the sun. However, this doesn't mean you need to stand directly in the sun to receive daily doses of UV rays. Ultraviolet light penetrates the clouds and your photochromic lenses will darken just fine under overcast skies. ? Do you want finer details on the working mechanism of photochromic lenses? The exact working mechanism is dependent on the material used to make the lens. This is explained below. ? How Do Plastic Photochromic Lenses Work? Plastic photochromic lenses are made from carbon-based compounds and this is what is reactive to light and changes structures in the presence of UV light. They are also called photochromic dyes.? Their actual chemical names are quite long like pyridobenzoxazines and indenonaphthopyrans - you don't need to bother with them. However, it is important to know that these organic chemical compounds react faster and change color quickly than molecules used in glass photochromic lenses.? Once exposed to light, the chemical bond in these dyes break causing a structural transformation that allows them to absorb more visible light.? The more the light absorbed, the darker the lens becomes; and there is the magic trick. Once UV light penetration reduces, these dyes go back to their initial structure and the lenses become clear as day all over again. ? Plastic photochromic lenses are more common than their glass counterparts and research is still ongoing on how to make these plastic lenses even better. ? How Do Glass Photochromic Lenses Work? Glass photochromic lenses have several minute amounts of silver halide scattered inside them. The popular halide used is Silver Chloride. Once these chemical compounds are exposed to ultraviolet rays, the silver ion compound gains an electron to become an ionic (or elemental silver). These released silver absorb visible light. Thus, the more silver released, the darker the lens becomes as it absorbs more visible light. ? Many photographic films employ this same silver halide chemical mechanism. Exposure to light causes the images on them to darken. However, photochromic lenses are different in that they revert back to their original clear appearance when the ultraviolet light source is taken away. Once UV rays are withdrawn, a second compound in the glass (usually copper chloride) accepts the electron back from the silver metal. This causes the reaction to be reversed and the lens becomes clear once again. While photochromic lenses made from glass are not common anymore, this first set of technology paved the way for the current trend employed in light-responsive glasses. ? ? Parameters Used In Photochromic Lenses And What They Mean ? ? There are various parameters used in the photochromic lens industry. It is important to understand these parameters as they allow you to pick the right lens for use. The various parameters include: 1. Material:? The material of a photochromic lens can vary depending on the manufacturer. The glass and plastic materials have been covered in previous sections. However, there is also the polycarbonate material which is very effective and widely used. Examples of materials you will find when shopping for a photochromic lens include: CR-39 (Columbia Resin 39), photochromic oligomer, PMMA (Polymethyl methacrylate), MR-8, MR-7, and PC.? Usually, polycarbonate is preferred because of its strength and resistance to impact. However, glass and plastic have their advantages over polycarbonate. For example, MR-7 is loved for its thinness and lightweightness. ? 2. UV Cut-off: This is the wavelength below which the substance or chemical used in the photochromic lens can absorb all the UV rays. Therefore, the higher the UV cut off the better it is at blocking UV rays.? Most photochromic lenses at Maat Optical have a minimum UV cut-off of 360, while some can go as high as 410 which is very good.? 3. Option Color: Photochromic lenses come in different colors which can include blue, yellow, clear, brown, gray and so on. While one color might have an advantage over the other, they are mostly selected based on personal preference. 4. Abbe Value: The abbe value is the measure of the extent to which light is separated or dispersed when it passes through the lens. The higher the abbe value, the better. Plastic materials have been found to have the best abbe value while polycarbonate materials have been found to have the worst. An abbe value greater than 50 is very good. Other parameters of a photochromic lens include power range, coating and specific gravity. ? How Quickly Do Photochromic Lenses Work? Photochromic lenses darken in 30–60 seconds on average when exposed to ultraviolet light. To clear, they take a bit longer: 2–3 minutes is normal.? Scientists are still working with photochromic dyes to quicken the reactivity of the lenses. In the future, we could see faster and faster activation and clearing times. ? How Does Temperature Affect Photochromic Lenses? The rate at which photochromic lenses darken or clear up is impacted by temperature. When it’s colder, the lenses are apt to darken a bit more fully but take a longer time to clear up. When it’s warmer, they may not darken quite as much but will clear up more quickly, as the molecules within them are more reactive. ? ? Do Photochromic Lenses Wear Out? The more photochromic lenses are exposed to sunlight the less they become reactive to light and the longer they take to darken when exposed to sunlight. They may also develop a yellowish tint with use over time.? Eventually, your photochromic lenses will become less reactive to ultraviolet light and will take longer to shift between their two states. They may also take on a yellowish tint that signals their age. Most photochromic lenses will perform well for three years or more, however, so they’re still a long-term investment. ? Conclusion Photochromic lenses are of great value to everyone as they protect your eye from harmful UV rays. ? Photochromic lenses are able to do this due to the presence of some specific chemicals. Photochromic lenses don’t last a lifetime, however, you can get a very durable and authentic photochromic lens from Maat Optical.
中文