Well, not me, since I started wearing glasses at 19, but I still notice more than most. Here's a video someone took of a vehicle ride down Lookout Mountain. I've ridden it a thousand times and am always on the lookout for hazards. The video is pretty boring, but go right to 2:13 and see what's on the other side of the guardrail. I saw this right away.
http://www.youtube.com/watch?v=8k24Dnn_RmM