Abstract

A pupillometer for measuring pupil diameters in total visual darkness has been constructed. It consists of an infra-red electron telescope arranged to observe the eye from a distance of about six inches. An attached light source irradiates the eye with invisible infra-red radiation. A scale is projected into the field of the instrument to measure the pupil diameter directly. The instrument can be used in dim and bright visible light as well as in darkness. Other possible uses of the instrument for infra-red examination of the eye are suggested.

© 1948 Optical Society of America

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