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20-foot line accurate American Medical Association aminers appendages artificial light astigmatism blepharitis Board of Health borderline cent defective CHAPTER child children's vision ciliary body co-operation Committee on Health conservation of vision CONSERVING VISION cornea correction defective vision defects of vision diopters distance duties eye and vision eye conditions eye defects eye disease eye examinations eye inspections eyeball eyelids eyesight glare health defect health examination hyperopia hyperopic Illinois illumination indicate lachrymal lens Letter Chart methods muscle National Education Association National Society ophthalmologists parents physical examinations practice present Prevention of Blindness Problems in Education public schools pupils questionnaire refractive error regular grade school children school examinations school physicians sclera SIGHT OF SCHOOL sight-saving classes Signs and Symptoms Snellen chart Strabismus symbol chart symptoms of asthenopia symptoms of eyestrain tion trained non-medical examiners treatment twelve foot-candles vision among school vision classes vision test visual acuity York City