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Educational content only
This page is general patient education, not medical advice. It does not diagnose conditions, recommend specific treatments for you, or replace a conversation with your eye care provider. Always consult a qualified clinician before making decisions about your eye health.
Anti-reflective, scratch, blue light — what coatings actually do.
Modern lenses are layered with thin coatings that do real work — and a few that don't do as much as they're marketed to. Here's what each coating actually accomplishes and when to pay for it.
Worth paying for
What's essential — and what's optional.
Essential
Anti-reflective (AR) coating
Eliminates reflections from headlights, screens, and bright backgrounds. Reduces eye fatigue and makes your eyes visible to others. Quality AR (multilayer) costs more but lasts much longer. The single best lens upgrade.
Important
Scratch + hydrophobic
Plastic lenses scratch easily; scratch coating helps but isn't a guarantee. Hydrophobic and oleophobic coatings shed water and fingerprints so the lens cleans easily and stays clear in the rain. Usually bundled with quality AR.
Likely yes
UV coating (often included)
Blocks UVA/UVB that contributes to cataracts and pterygia. Many materials (polycarbonate, Trivex, high-index) block 100% of UV inherently. CR-39 plastic doesn't, so a coating helps. Check what's in your lens already.
Debated
Blue light coatings
Marketed for digital eye strain and sleep. The strongest claim is the most uncertain — large reviews have found no significant impact on digital eye strain or sleep quality from filtering blue light. May feel useful subjectively; the science is unsettled.
Skip the upcharge if
Someone's trying to sell you premium coatings on a $20 pair of readers, or any single coating costs more than 50% of the lens price. The biggest gains come from quality multilayer AR; everything else has diminishing returns.
Common questions
Honest answers to common questions.
Does AR coating wear off?+
Eventually yes. Lower-quality AR can craze or peel within 1-2 years. Premium multilayer AR holds up for 3-5+ years with normal care. The first sign is uneven cleaning — water and oil that won't wipe off.
How should I clean coated lenses?+
Rinse with water first to wash away grit, then use a microfiber cloth and a few drops of dish soap or lens cleaner. Avoid paper products (tissues, paper towels) which contain fibers that scratch. Never wipe dry lenses.
Do blue light glasses really help with sleep?+
The link between evening screen exposure and sleep is well established. The link between blue-blocking lenses and improved sleep is much weaker. If you want to protect sleep, dimming screens and avoiding them an hour before bed has stronger evidence.
Are photochromic (Transitions) lenses worth it?+
If you spend time outdoors and don't want a separate sunglasses pair, yes. They darken in UV light (not behind a windshield in most cars — most car glass blocks UV). They take 30-60 seconds to darken and a few minutes to clear. Activity levels and climate affect your experience.
Do polarized lenses count as a coating?+
No — polarization is a film inside the lens, not a surface coating. It dramatically reduces glare from water, snow, and pavement. Different from regular tinting, and not always compatible with all prescription types.