Yesterday I went for my eyes tested, all was fine and my prescription hasn't really changed. One of the things I wanted from my visit was a pair of glasses that would be suitable for cycling. I know you can get prescription cycling glasses, I've owned a pair in the past but I've found that you end up paying through the nose for what is essentially a cheap pair of glasses with prescription inserts.
I found a pair of sunglasses which have a better quality build and enough eye coverage to provide protection. I've ordered them with a light tint and 100% UV protection.