Scratches Impact resistance and compromise light reflection. Replace your lenses when scratched for optimal vision and safety. When shopping for lenses, look for ones that are scratch-resistant and sturdy. Inquire about anti-scratch warranties from your optician.There's nothing worse than smudges and smears on the prescription lenses of your glasses. Although eyeglasses can be expensive, take care of them properly by protecting them from the elements, both outside and inside the lens. If you treat your glasses properly, you should get years of great use out of them.