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School of Optometry, University of California Berkeley, California *Submitted on June 25, 1963, for publication in the March, 1964, issue of the American Journal of Optometry and Archives of American Academy of Optometry. †Optometrist. Ph.D., Member of faculty. Fellow, American Academy of Optometry. **A description of these areas has been given previously.2
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Robert B. Mandell (1964) studied this question.
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