Eye exercises are for strengthening the tendons around the eyes, the muscles which help you to move them. The exercises themselves are moot, they merely help you become more aware of your peripheral vision. People can confuse this with "improvement" of vision rather than just paying more attention to your senses. In cases where eyes have been damaged, or the visual cortex itself, there are a few eye "exercises" that are prescripted by an opthamologist. But only very few have been clinically proven to actually improve vision...that is, to strengthen and re-coordinate the eye tendons. If the eyeball has been damged (white area, cornea, etc.) then the exercises aren't done.