I was wondering if anyone had any information on a link between amphetamines and vision improvement. I take prescribed medication and have noticed that when my mind is focused, my vision tends to become very sharp and the clear flashes tend to last a longer time, and do no blur even after blinking. Even after a few days without it I seem to be making steady progress. I wonder if there was any such study. From what I've read on the other hand abusing it or using it improperly can lead to blurry vision. Any thoughts?