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Johnson, an optometrist practicing in Chicago, taught Fitzgerald fromthe age of 8 to strengthen his vision. Johnson taught him to cover oneof his eyes with one hand and catch a tennis ball with the other.(Johnson會叫小時候的Larry遮他的一邊眼而且用一隻手來接住網球)Johnson also used multiple technical vision tests and exercises torefine Fitzgerald's visual skills and to focus and enhance hisperipheral vision.