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200 pupils tested acute vision acuteness of vision Alph alphabet test average distance ball best light cent close degree detected diameter different sized letters discern divided by 200 Doctor of Philosophy Dot test feet and try feet variation figures Grade III grades Graph greatest distance IlKt illiterate cards illiterate E largest number letter test letters and characters letters or characters letters or dots letters were seen limit of vision mean variation normal eye normal vision number of pupils obtained by tests operator percentages poor vision pupils saw representing the acuteness represents the results required to move Results obtained SCHOOL CHILDREN seen at 20 series of tests seven tests sixteen feet sixteen foot letters small squares Snellen 20 ft Snellen letters Snellen measurements subnormal table 11 tance tangent test for acuteness tests under consideration total combined distance twenty-four feet University of Pennsylvania vision as shown VISION OF SCHOOL vision showing