good luck with that.
i had an actual prescription for tinted windows from an opthamologist. i still got tickets. according to the police that pulled me over, you have to have the prescription put on your drivers license (much like corrective eyewear). whats the downside? if you get pulled over while driving a car without tint, you will also get a ticket for driving without tint.

i gave up. i seriously do have light sensitive eyes, and it still wasn't worth the headache!