Key points are not available for this paper at this time.
Illinois College of Optometry Chicago, Illinois *Submitted on November 6, 1962, for publication in the May, 1963, issue of the American Journal of Optometry and Archives of American Academy of Optometry. This paper is based on a Masters thesis submitted to the Graduate School of the Florida State University in partial fulfillment of the requirements for the M.S. degree. †Ph.D. Member of faculty.
Harold Schuckman (1963) studied this question.