I discovered a simple fix to allow me to go into brightly lit stores- I now wear a sun visor all the time, indoors and out. With the visor, I am able to make it in a supermarket or department store long enough to get what I need. I don't care if it looks stupid inside, the sun visor brim has been quite helpful. I always wear the sun visor outside now too. Together with my polarized moisture chamber 7eye sunglasses, it makes it possible for me to go outside on sunny days, and to drive when the sun is out. I don't know why I didn't realize I should be wearing a sun visor all the time before this. It looks stupid, but it provides some relief. The typical sun visors have 3" brims; I just ordered one with a 4 1/2" brim; hopefully this will help even more. Judy