William Horatio Bates, Better Eyesight Magazine — September 1920
“ If one's memory and imagination are imperfect, they can be improved by consciously making them worse than they arc. Persons with imperfect sight never remember or imagine the letters on the test card as perfectly black and distinct, but to imagine them as grey and clouds is very difficult, or even impossible, and when a patient has done it, or tried to do it, he may become able to avoid the unconscious strain which has prevented him front forming mental pictures as black and distinct as the reality. To make imperfect sight worse is always more difficult than to lower normal vision. ”
