[QUOTE=wolfman]
Hey since there seem to be people who know shooting, I have a question. After thinking about that guy with artificial feet, and his fight to get into competition I was wondering if shooters are allowed to wear contacts, glasses or have LASIK? It does seem like it would be an artifical aid fundamental to the ability of the sport, andhas there ever been an issue?
[/QUOTE]
Even if the shooter does not require a prescription, glasses are generally worn. There can be a lot of stuff flying around on the line (most often, spent brass), and the last thing you need is someone’s spent brass flying into your eye after it has been ejected from his firearm. Of course, if you do need prescription glasses normally to see, you are allowed to wear them on the range. I didn’t need prescription lenses, but I did have a nice pair of yellow-tinted shooting glasses. They were perfectly fine according to the rules, and because of that, were never questioned by the officials of the matches I shot in.
Generally, the rules regarding dress and such for Olympic-style shooting matches are spelled out clearly in the rulebooks. I have no idea where my rulebooks got to (as you might guess, I was a competition shooter but that was years ago), but IIRC, they were quite detailed, going so far as to dictate such things as how think your shirt and pants could be, and how high up your ankle your shoes/boots could go. Parameters for your equipment were also spelled out, and subject to inspection by match officials before it could be used in competition–again, a very detailed list of things: specifications for my shooting jacket, my glove, my sling, and naturally, my rifle itself were all minutely spelled out.
To answer the OP, pulling a trigger isn’t strenuous. It’s aiming the firearm and pulling the trigger over and over again in such a way that each shot scores a bullseye that is strenuous. When a match can be lost if a shot is out by a hair’s breadth, you want every possible advantage. Drugs can help here, as mentioned upthread, but of course they’re not allowed. So you look to managing your heart rate, your breathing, and so on yourself. It may not be quite the same as running the marathon or swimming or gymnastics, but shooting is physical in its own way; I would get up off my point after as little as two hours, and be bathed in sweat just from trying to hold my position, control my breathing and heart rate, and still managing to hit the bullseye–in my case, only most of the time. I actually tried out for a spot on my country’s 1984 Olympic shooting team but missed it by–you guessed it–a hair’s breadth. 
Added on preview: no, support tripods are not allowed either. See the rulebook for what is allowed–if it’s not in there, it’s not allowed.