Key points are not available for this paper at this time.
Chairman C. L. Treleaven, Rita Walsh, E. L. Higgins and C. A. Radde† *Report presented at the annual meeting of the American Academy of Optometry, Philadelphia, Pennsylvania, May 18, 1947. For publication in the July, 1947, issue of the AMERICAN JOURNAL OF OPTOMETRY AND ARCHIVES OF AMERICAN ACADEMY OF OPTOMETRY. †Optometrists. Fellows, American Academy of Optometry.
Fry et al. (1947) studied this question.