Abstract

Light thresholds of normal and aphakic subjects, and subjects with implanted synthetic lenses, were measured under conditions of darkness and with extraneous violet (405 millimicrons) and ultraviolet (365 millimicrons) sources of equal apparent brightness in the visual field. It was found that the ultraviolet source caused a greater increase in the threshold of the normal eye than did the violet source. The additional increase could not be attributed to stray light, nor to constriction of the pupil. From the results obtained with subjects who had synthetic lenses, it was concluded that fluorescence of the lens of the normal eye would account for the additional increase in threshold produced by the ultraviolet source.

© 1955 Optical Society of America

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