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| | Tom Quackenbush Sheet |
 | | Bates stated that errors of refraction (including nearsighted, farsighted, astigmatism, so called presbyopia) and strabismus, are caused by excessive strain in the six external eye muscles. |
 | | Bates proved that blur, (other than from diseases and accidents), is caused by a person acquiring improper, subconscious, strained vision habits, which occur during a period of stress. |
 | | Bates wrote in the preface of his 1920, "...theories, often stated as facts, have served to obscure the truth... |
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