Key points are not available for this paper at this time.
School of Optometry, University of California Berkeley, California *Read before the annual meeting of the American Academy of Optometry, San Francisco, California, December 10, 1960. For publication in the October, 1961, issue of the American Journal of Optometry and Archives of American Academy of Optometry. †Optometrist. Ph.D., Fellow, American Academy of Optometry, Member of faculty.
Monroe J. Hirsch (Sun,) studied this question.