Primate Research Center, Washington State University Pullman, Washington *Read before the annual meeting of the American Academy of Optometry, Columbus, Ohio, December 15, 1964. For publication in the August, 1965, issue of the American Journal of Optometry and Archives of American Academy of Optometry. †Psychologist. Ph.D. Member of faculty. Fellow, American Academy of Optometry.
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Francis A. Young (1965) studied this question.