Extra dark sunglasses

Does anyone have or know the best place to buy extra dark polarised glasses. I have looked on the net and although they say dark they don't really look it.

You might try an eye clinic, if that is not out of the price range. I actually just use a pair that I got at a shopping mall booth. I don't think they are polarized, but they are super dark, have extra big lenses, and have large temple arms to cut out the stray side light. I would be lost without them, especially in summer when the sun is super strong in Tokyo! I don't know if they offer good protection, but they certainly soothe the eyes!
Carla

thanks for the tip - I will give it a go!