Tint is not about reducing light to your eyes, that's what sunglasses are for. It's about reducing heat in the car when it's parked in the sun.
Personally, I can't stand driving a car w/ dark tint, and I can't stand ending up at a stop sign across from someone that's got tint so dark that I can't see the driver. But I can understand why someone would want 5% all around on the car if they have to park outdoors all summer long. The thing is, most people just like 5% tint because they want to murder-out their ridez yo.
