There's such a thing as being too open-eyed.
Dilate the pupil too much and parts of the lens that aren't meant to be used come on line. They don't focus properly. Useable resolution drops drastically.
Plus, on a sunny day, it's extremely unpleasant. It's fun at night though. Kind of like that hokey special effect they used to use for dream sequences. Everything's blurry and sparkly at the same time.
[link|http://www.angelfire.com/ca3/marlowe/index.html|http://www.angelfir...e/index.html]
Sometimes "tolerance" is just a word for not dealing with things.