I had lasik surgery in my 30's and the doctor stated that I would be married to sunglasses for the rest of my life. After I self retired five years ago, I haven't worn sunglasses since and actually have perfect vision, unless I'm at the computer for several hours. I go out in the sun can stare at the sky and don't feel any strains or any other difficulties. I work in my farm all day long in the hot bright sun and it doesn't bother me at all.