Your cat having glasses is a sign of her eyes been stresses so much, which results in inablility to see without blur (or other symptoms). The causes can be many, fe genetical, but the most possible *for a cat* is reading without adequate light, which is one of stupidest things you can do and shows that you don't care for your cat, non caring peasant. Also don't get offended, it was all a joke, A JOKE I SAID *cries*