Pennsylvania State College of Optometry, Philadelphia, Pennsylvania *Read before the annual meeting of the American Academy of Optometry, Chicago, Illinois. December 14, 1947. For publication in the November, 1948, issue of the AMERICAN JOURNAL OF OPTOMETRY AND ARCHIVES OF AMERICAN ACADEMY OF OPTOMETRY. †Optometrist. Fellow, American Academy of Optometry. Instructor in Optometry.
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William G. Walton (1948) studied this question.