FOR THE PURPOSE of investigating the value of iseikonic glasses, a study was made of the 1,027 patients examined for aniseikonia at the Institute of Ophthalmology of the Presbyterian Hospital, New York, between December 1936 and December 1941.1 These patients were referred for the examination by ophthalmologists and characteristically were those whose complaints bore a close relation to the use of the eyes and on whom the usual ocular therapeutic measures had been tried without relief being obtained. At the conclusion of the examination of the patient a report of the result was sent to the physician who had referred the patient. The trial of iseikonic glasses was not advised merely because aniseikonia was demonstrated, but the opinion was given that a factor was revealed by the examination which had not previously been corrected and which it was possible to correct. The decision whether iseikonic glasses were to be