The anti-reflective coating on my glasses is smeary (or foggy). What causes that, and what can I do about it?

Cleaning your eyeglasses improperly is a common cause of problems with anti-reflective coating. When you bought your eyeglasses, your eye doctor probably explained the best way to care for them; usually, you use lens spray and a certain type of cloth, like microfiber. Sometimes, your eye doctor may be able to remove the damaged coating, but usually not. There's nothing you can do at home.