I know of no studies that prove HGH helps eyesight.
Bart (ophthalmologist)
You're right. They are just claims. You would certainly know more about the science than I. I was just trying provide a published source for what was stated earlier.
How would HGH help physiologically or anatomically?
Most athletes that use HGH use it for its recovery purposes, correct?
Hypothetically speaking...
Say golfer A gets hurt (shoulder, knee, whatever) in September and will be out of competition for 6-8 months. His first tournament back is the Masters the next April. Without any competitive rounds under his belt in the new year, he misses the cut.
Golfer B has the same injury, at the same time, with the same 6-8 month window, but he takes HGH to recover more quickly from his injury. He gets back to competition earlier and knocks the rust off on the West Coast swing and when the Masters rolls around he makes the cut (or wins).
Some people don't consider HGH use for recovery purposes as on the same level as other steroid use (see Andy Pettite). Personally, I do. In the example above, I think golfer B cheated to get ahead.
Perhaps that is an oversimplified example. (Not trying to be argumentative, those are just my thoughts.)