Five hundred patients were examined for low-vision lenses at the Lighthouse (The New York Association for the Blind.) Lenses were prescribed for 240, all of whom were later interviewed to decide whether or not the lenses were beneficial.* The examiner concluded that 173 patients were rehabilitated to an acceptable degree.
The results of this project showed two significant facts: 1. A correction for lenses seemed to make a worthwhile improvement in 48% of the patients examined. 2. Of those for whom lenses were prescribed, 72% were judged to have a successful result by the standards of both the examiner and the patient.
The criteria for success or failure depended upon an interview with the patient after he had worn his correction for two months. This interval seemed advisable in order to avoid the influence of initial enthusiasm. The decision of success or failure depended upon the answers to the following
FONDA G. Report of Five Hundred Patients Examined for Low Vision. AMA Arch Ophthalmol. 1956;56(2):171-175. doi:10.1001/archopht.1956.00930040179002