Can heat scratch glasses?

High temperatures can destroy the various coatings on your lenses, such as anti-reflective coating and scratch-resistant coating. Damage to these coatings will cause the lens to look cracked or crazed.” Exposure to extreme heat can warp the shape of your lenses, which can significantly affect your vision.

Can hot water damage glasses lenses?

Don’t wash your glasses in hot water. Many prescription eyeglass lenses have a protective coating over them and washing them in how water can cause this coating to break and peel off. The hot water can also warp the lenses and cause them to twist the frames or pop out of the frames.