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abnormal condition abnormal function after-images amblyopia apparent artificial lenses astigmatic eye astigmatism attention autosuggestion Bates method body brain called cataracts cause central fixation CHAPTER ciliary muscle close the eyes colored conduct conscious mind constantly correct cure demonstrated develop distance dysfunction effort explanation eye specialist eyeball eyestrain faltering fault feet habit hour human eye hyperopia illusions images imagination impressions improvement interested iritis lens letter look mechanism of vision memory ment mental method of Dr minutes myopia near-sighted nerve never normal eye normal vision objects Oliver Wendell Holmes ophthalmologist optic nerve optometrist patient period physician picture practice presbyopia produced rays of light realize refraction refractive error relaxation relieved retina secured seen sight simple Snellen Card Snellen Test Card specific spectacles spot squint strabismus strain strong swinging symptoms technique tension text books thought tion told treatment unconscious visual center wearing glasses