Abstract

The first measurements of night myopia showed a clear decrease in the minimum quantity of light needed to reach a certain visual acuity when the night myopia was compensated. The results indicated a possible decrease in absolute thresholds. In the present paper we study, with four observers using binocular vision and white light, the influence of night myopia on these thresholds for target areas ranging from 30 seconds to 10.5 minutes and retinal zones from the fovea up to 15° eccentricity. A statistical technique secures very uniform results. We find unquestionably that the values of the threshold decrease substantially in every case when night myopia is compensated. The average diminution is 50 percent. On the other hand, the abnormal light distribution on the retina caused by night myopia, when compensated, may modify the laws relating absolute thresholds with stimulus area. We have studied these possible changes in the generally admitted range of validity of Riccó’s law without finding any noticeable variation.

© 1949 Optical Society of America

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