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Batesian Peppard features "the long swing" (a relaxing exercise done by swaying the body from side to side); the deliberate reading of each letter in a word separately; tennis (especially for nearsighted people, to promote shifting and prevent staring); and reading upside down.
Samuel Renshaw, Professor of Experimental Psychology at Ohio State University, believes that training may not only correct many eye defects but also improve normal vision. His methods have been adopted by Ohio State's Naval Recognition School, which has sent some 500 Navy teachers out to help sailors recognize enemy aircraft, spot distant periscopes and life rafts.
The indisputable point about eye exercise: sometimes it works.
That is, he could see at 20 feet what he should have seen at 40.