Eye exercises do not improve vision because the ability of the eye to see well is based on the shape of the eye, the eye's ability to shift focus and the size of the pupil, according to WebMD. While the eye's ability to shift focus declines as people get older, the size of the pupil and the shape of a person's eye do not change.
When eye patients are told that they need to wear corrective lenses, they are given this prescription because of the way that their eyes are naturally shaped. Performing eye exercises will not alter the shape of the eye or the size of the pupil, according to All About Vision. It will also not improve the eye's ability to shift focus.