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Summer Heat vs. Eyeglasses: What You Should Know About Lens Crazing
From beach day hangs to poolside lounging, summer offers a lot of sun-filled fun—but it shouldn’t come at the expense of your eyeglasses. High heat can damage lenses and lead to irreversible issues, specifically lens crazing. So here’s what you need to know about “crazing” and how you can protect your glasses from it:
Heat is the biggest hitter
Campfires, grilling, and poolside sunbathing make the perfect summertime moment. But the common denominator? They’re all heat-heavy activities that can put your glasses at unnecessary risk.
High heat exposure causes the lens and its coating to expand. With repeated exposure, the coating will eventually show signs of crazing. At first glance, it may seem like a harmless blur, but a closer look reveals what lens crazing looks like—web-like cracks forming along the lens surface, and with that level of damage, cleaning won’t be enough for a remedy.
A common scenario that leads to lens crazing is leaving your glasses in a car parked in the sun. As sunlight passes through the window, the car begins to absorb heat, turning it into a makeshift oven. Exposure to this trapped heat “cooks” the coating on your lenses over time, causing irreversible damage that looks like a blurry or cloudy mark on your glasses.
Beating the heat
The best way to protect your glasses from high-temperature damage is simple: avoid constant heat exposure and be mindful of the activities that put them at risk.
Stay away from high-heat conditions. Tuck your glasses safely aside while grilling; keep them in your bag instead of leaving them in your car; and avoid placing them near campfire flames.
In addition to maintaining a safe distance from hot conditions, it’s also important to adopt a gentler cleaning routine. Heat alone can stress your lens coatings, so using proper cleaning methods can help mitigate lens crazing.
What to do with lens crazing
If you notice a stubborn blur that refuses to go away despite consistent cleaning, it may be more than just surface smudges; it may already be crazing. Once cracks form in the lens coating, the damage is permanent—no cleaning solution or treatment can reverse it.
The best step for your glasses is to visit the nearest EO branch, so your lenses can be assessed. Our optometrist can advise you on suitable replacement options so you can get back to enjoying the summer season with comfortable, clear vision.
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