Lens coatings are applied to spectacle lenses after manufacture to improve performance, durability, or comfort. Some are genuinely useful. Others are heavily marketed but offer limited benefit for most people. Dr Shibal Bhartiya explains what each coating does, who benefits from it, and what to prioritise when choosing eyeglasses.
Dr Shibal Bhartiya is a fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator with over 25 years of experience. Her approach focuses on identifying risk before damage is irreversible, simplifying treatment decisions, and protecting vision long-term. Emphasis on early detection, risk assessment, and continuity of care. She is rated 5 stars across 1,500+ patient reviews on Google.
Anti-Reflective Coating
Anti-reflective (AR) coating is the most clinically important lens coating available. It reduces reflections from both the front and back surfaces of the lens. This improves the amount of light reaching your eye and reduces visual fatigue, particularly during screen use and night driving.
Without AR coating, light reflects off lens surfaces rather than passing through. This creates glare, ghost images, and halos, especially in low-light conditions. AR coating eliminates most of this. It also makes lenses nearly invisible, which reduces the distraction of visible reflections in your glasses.
AR coating is especially important for high-index and polycarbonate lenses. These materials have higher refractive indices than standard plastic, which means they reflect more light without coating. If you use computer glasses or drive at night, AR coating is not optional.
Most quality AR coatings also include a hydrophobic (water-repellent) and oleophobic (oil-repellent) outer layer. This makes the lenses easier to clean and more resistant to smudging.
Scratch-Resistant Coating
No lens material is completely scratch-proof. However, scratch-resistant coatings harden the lens surface significantly and extend the useful life of the lens.
Polycarbonate and high-index lenses are lighter and thinner than standard plastic, but they scratch more easily without protective coating. A scratch-resistant coating is particularly important for children’s glasses, where daily wear is rough and replacement is costly.
Most modern lenses come with scratch-resistant coating as standard. If yours do not, ask your optician to include it. Check whether the coating carries a warranty before purchasing.
UV-Protective Coating
Ultraviolet radiation damages the eye over time. Long-term UV exposure is linked to cataract formation, retinal damage, and pterygium. A UV-protective coating blocks ultraviolet rays before they reach the eye.
Standard clear plastic lenses block some UV light but not all. A UV-blocking coating brings protection to 100% across both UVA and UVB spectra. This is particularly important if you spend significant time outdoors.
Polycarbonate and high-index lenses have built-in UV protection. So do photochromic lenses. If your lenses do not include UV protection as a standard feature, always request it. The cost is minimal. The long-term benefit to your lens and retinal health is real.
If you want full protection outdoors, consider quality sunglasses with UV400 certification. These block all UV wavelengths below 400nm and provide wraparound protection that clear lenses with UV coating cannot replicate.
Patients with glaucoma or those at risk of retinal disease should be especially consistent about UV protection. UV damage is cumulative and irreversible.
Anti-Fog Coating
Anti-fog coatings prevent the lens surface from misting when you move between warm and cold environments. This became particularly relevant during the pandemic, when mask-wearing caused glasses to fog repeatedly.
Two main types exist. The first is a permanent coating applied during manufacture. The second requires periodic activation with a specific cloth or spray. Results vary between products and individuals.
Anti-fog coating is useful for people who work outdoors, exercise in cold weather, or wear masks for long periods. For most indoor users it is a lower priority than AR or UV coating.
Photochromic Lenses
Photochromic lenses darken automatically in sunlight and return to clear indoors. They respond to UV radiation, which means they darken outdoors but may not darken sufficiently inside a car, where UV is partially blocked by windscreen glass.
These are convenient for people who move frequently between indoor and outdoor environments. They include built-in UV protection. But they do not replace dedicated sunglasses for activities involving prolonged bright light exposure, driving in bright conditions, or sports.
Blue-Light Filtering Coating
Blue-light filtering coatings are widely sold as a solution for digital eye strain. The evidence does not support this. A major Cochrane systematic review published in 2023 found that blue-light filtering lenses do not significantly reduce eye strain, improve sleep quality, or improve contrast sensitivity compared to standard lenses.
Digital eye strain is real. Its causes include reduced blink rate, poor screen ergonomics, and uncorrected refractive error. These are better addressed through the 20-20-20 rule, proper screen positioning, and a comprehensive eye examination rather than through lens coating.
Blue-light coating is not harmful. But for most people it is an unnecessary cost.
Which Coatings Should You Prioritise?
For most adults, the following three are genuinely worthwhile: anti-reflective coating, UV protection, and scratch-resistant coating. These address real optical and health-related needs.
Anti-fog coating is worthwhile if your lifestyle or work environment makes fogging a regular problem. Photochromic lenses are a practical choice if you move frequently between indoor and outdoor environments. Blue-light filtering coating can be skipped for most people based on current evidence.
Discuss your specific work, lifestyle, and visual demands with your eye doctor before making a decision. The right combination depends on how and where you use your glasses.
Frequently Asked Questions
Is anti-reflective coating worth the extra cost?
Yes, for most people. AR coating reduces glare, improves clarity, and reduces eye fatigue during screen use and night driving. It is the single most useful coating available and is particularly important for high-index and polycarbonate lenses, which reflect more light without it.
Do I need UV coating if I wear sunglasses outdoors?
If you consistently wear UV-protective sunglasses outdoors, your clear lenses are primarily in use indoors where UV exposure is low. However, most people do not wear sunglasses consistently in all outdoor situations. A UV coating on your clear lenses provides continuous protection at minimal cost.
Do blue-light glasses prevent eye strain?
Current evidence says no. A 2023 Cochrane review found no significant benefit of blue-light filtering lenses for reducing digital eye strain. Better strategies include taking regular screen breaks, blinking deliberately, and getting your eyes checked to rule out uncorrected refractive error.
Are scratch-resistant coatings permanent?
No. Scratch-resistant coatings reduce the risk of surface damage but do not prevent scratching entirely. Cleaning lenses with abrasive materials, tissues, or dry cloth will damage even coated lenses over time. Use a microfibre cloth and lens-appropriate solution.
Which lens coatings are best for children?
Scratch-resistant coating is the most important for children, given the rough daily use lenses receive. UV protection is also essential. Polycarbonate lenses are usually recommended for children because they are impact-resistant and come with built-in UV protection. AR coating is beneficial but may need more frequent cleaning.
Read the research articles
This article was written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram, known for ethical, patient-centred glaucoma care and independent glaucoma second opinions. This article was edited in April 2026.
She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.
Available on Pubmed and Google Scholar
Dr Shibal Bhartiya
Glaucoma • Second Opinion • Advanced Care
www.drshibalbhartiya.com
+91 88826 38735
