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Article
August 1962

The Effects of Blur upon Perimetric ThresholdsA Method for Determining a Quantitative Estimate of Retinal Contour

Author Affiliations

St. Louis
Dr. Fankhauser is now at the Universitaets Augenklinik, Inselspital, Bern, Switzerland.; From the Department of Ophthalmology, Washington University Medical School. This research has been supported in part by Grant B-2168 from the National Institute of Neurological Diseases and Blindness, National Institutes of Health, Public Health Service, Bethesda, Md., and in part by a Fight for Sight Fellowship F-142 from the National Council to Combat Blindness, Inc., New York.

Arch Ophthalmol. 1962;68(2):240-251. doi:10.1001/archopht.1962.00960030244016
Abstract

Introduction  This paper serves a twofold purpose. Some of the effects of blur of the retinal image upon perimetric thresholds are considered, and a clinical procedure is presented which utilizes these characteristics in order to provide a quantitative estimate of retinal contour. The method does not provide a measure of the true contour, but rather provides a precise reference or relative contour which may be compared with that obtained in other portions of the retina, or which may be compared with a similar set of determinations obtained at a different time. The procedure is based upon the assumption that the contrast or luminous increment threshold is lowest when the perimetric test target, imaged upon its corresponding retinal area, is focused upon the retina. The clinical method permits quantitative determination of shifts in a fore-and-aft direction of the retinal receptors in that part of the visual field usually studied with a

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