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School of Optometry, University of California Berkeley, California *This investigation was made possible by a grant-in-aid from the American Academy of Optometry. Submitted on March 3, 1949 for publication in the May, 1949, issue of the American Journal of Optometry and Archives of American Academy of Optometry. †Optometrist. ‡Optometrist. Fellow, American Academy of Optometry. Assistant Professor of Optometry.
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Marg et al. (1949) studied this question.
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