I had to pass this on to all of you so you know...I recently got a ticket for tinted front windows in IL, a friend of mine said, "did you know you can get medical permission for tint?" I had no idea, it just so happened that I got my cataracts removed a few months ago and my eyes are sensative to light. so I called the sec of state, got the form in the mail , had the doctor fill it out, and w WALA, I'M LEGAL!!!! if you ever see a plate in IL with black letters, thats the plate for legal tint. the form number in case you want to know is 625ILCS5/3-412
if your skin is sensative to the sun, that also works.....GOOD LUCK!