The Ohio State University Columbus, Ohio *Read before the annual meeting of the American Academy of Optometry, Boston, Massachusetts, December 13, 1958. For publication in the March 1959 issue of the American Journal of Optometry and Archives of American Academy of Optometry. This study was supported by a research grant, N.S.F. Grant No. 3877, from the National Science Foundation. †Ph.D., Member of the faculty. Now at the Department of Ophthalmology, Washington University School of Medicine, Saint Louis, Missouri. ‡or some component of those receptors
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Jay M. Enoch (1959) studied this question.