Technically you can't...BUT...if you don't have 20/20 vision there are several workarounds...you can get a note from you optometrist saying that the looking at the sun head on in your car gives you migraines or is blinding or something else you can get a note which will allow tint on the windshield below the 2in allowed in some states on the top of it...


...then again, heard this from a Corvette owner and haven't actually tried it myself yet.


P.S. Almost any tint shop will take your money and tint your windshield, the doctor's note would be just for WHEN you get pulled over by the police.