My eyesight is terrible. Without my glasses I can't tell a man from a woman from 5 feet away. Well just for kicks I tried shooting without my glasses on my home 9' diamond. I was expecting to miss by a mile. I was SHOCKED that I played nearly my speed without glasses. I couldn't really see the balls but I could feel them. I instantly realized all the old timers who blame their eyes were full of sht. How many times we've seen an old timer who can't run 3 balls say "my days of stringing racks together are over, my eyes are just not the same anymore".