Rinse your prescription sunglasses under clean, lukewarm tap water within minutes of leaving the pool or sea. Saltwater leaves behind mineral crystals that scratch coatings, and chlorine breaks down anti-reflective and UV layers over time. A quick rinse, a gentle wash with mild soap, and proper drying are all it takes to protect your investment and your vision correction.
Why Are Saltwater and Chlorine So Damaging to Prescription Sunglasses?
Salt deposits are abrasive. When seawater evaporates on a lens, microscopic salt crystals remain and act like fine sandpaper every time you touch or wipe the surface. Chlorine, on the other hand, is a chemical oxidiser. Prolonged or repeated exposure degrades lens coatings — particularly anti-reflective (AR) coatings, polarising films, and hydrophobic layers — causing peeling, cloudiness, and colour distortion. Frames are not immune either: metal hinges corrode and acetate can warp or lose its sheen when repeatedly soaked in chlorinated water.
What Should You Do Immediately After Exposure?
The first five minutes matter most. Follow these steps as soon as you are out of the water:
Rinse thoroughly: Hold your sunglasses under a gentle stream of lukewarm tap water for 20-30 seconds. Never use hot water — it loosens lens coatings faster.
Apply a tiny drop of mild liquid soap: Use a soap free of lotions, moisturisers, or fragrances. Gently rub both sides of each lens and all frame surfaces with your fingertip.
Rinse again completely: Make sure no soap residue remains, especially around the nose pads and hinges where salt and chlorine accumulate.
Pat dry with a microfibre cloth: Never use a beach towel, shirt, or tissue — these materials carry grit that creates micro-scratches. Always carry a clean microfibre cloth in your case.
How to Clean the Frame and Hinges Properly
Frames collect grime in places you cannot always see. After the rinse-and-wash step, use a soft interdental brush or a clean cotton bud to gently dislodge salt or chlorine residue from hinge screws and nose pad crevices. For metal frames, dry them completely before storage — any trapped moisture accelerates corrosion. For acetate frames, avoid leaving them in direct sunlight immediately after washing, as wet acetate is more susceptible to heat warping.
Long-Term Maintenance: Protecting Your Coatings
Even with good post-swim care, coatings degrade over time. Here is how to slow that process:
Use a hard-shell case every time you are not wearing your sunglasses near water.
Apply a lens-safe spray designed for coated ophthalmic lenses — not general glass cleaners, which contain ammonia and strip coatings fast.
Schedule a professional clean at your optician every three to four months if you swim regularly. Ultrasonic cleaning machines remove residue from areas a cloth cannot reach without risking scratches.
Consider hydrophobic or oleophobic coating upgrades when you next order lenses — these repel water and salt more effectively than standard coatings.
When Should You Replace Your Lenses?
If you notice persistent cloudiness that does not clear after cleaning, visible peeling or bubbling of the coating, or any change in colour through the lens, it is time to replace the lenses rather than continue cleaning them. Damaged coatings scatter light and can cause eye strain, which defeats the purpose of prescription sunglasses entirely. Replacing lenses — not the full frame — is often a cost-effective option; check with your eyewear retailer about re-glazing your existing frame with fresh prescription lenses.
