Abstract

A brief review of the literature on night myopia and empty field myopia and the disagreement over their causes is presented. Measurements of the refractive state of the eye in reduced illumination and in darkness were made using an infrared skiascope. For about half of the subjects, there was an increase in the refractive state of the eye as the illumination was lowered. The contribution of accommodation to the night myopia measured, was generally small. Under conditions of complete darkness, all of the subjects showed variable spasms of accommodation.

© 1956 Optical Society of America

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