The Zone of Clear Single Vision at the Upper Levels of Accommodation and Convergence

School of Optometry, The Ohio State University Columbus, Ohio *An abridgment of a thesis presented to the Graduate School of The Ohio State University in partial fulfillment of the requirements for the M.Sc. Degree. Appreciation is expressed to Dr. Glenn A. Fry under whose supervision the work was completed, to Drs. Henry W. Hofstetter and Monroe J. Hirsch, and to the members of the staff of the School of Optometry for assistance in the formulation of this study. Read before the annual meeting of the American Academy of Optometry, Cleveland, Ohio, December 13, 1949. For publication in the Octboer, 1950, issue of the American Journal of Optometry and Archives of American Academy of Optometry. †Optometrist. Fellow, American Academy of Optometry. Member of faculty.