Med. lic., Gbg. Columbia University Optometry Laboratory New York, New York †From the Ophthalmological Clinic of the University of Upsala. Professor Frederick Berg, Chief. ‡Optometrist. Fellow, American Academy of Optometry. *UPSALA 1946. Appelbergs Boktryckeri A.-B. §The first of six chapters. The second chapter will appear in the June issue.
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Solve Stenström (1948) studied this question.