Abstract

The Maxwellian-view optical system provided a circular flash field of 10° diam, and at the peak of the flash, the field luminance was 5.4×105 L. A rotating-mirror shutter system permitted flash durations of 1.4 to 0.64 msec with constant pulse shapes for all durations. The maximum flash energy was 4×107 td · sec or 0.042 cal/cm2 at the retina, neglecting losses in the ocular media. With the infrared removed by filtering the beam, the maximum energy was reduced to 3×107 td · sec or 0.012 cal/cm2.

The criterion measure for visual performance following the flashes was the identification of Sloan–Snellen letters of different sizes. The letters were transilluminated with luminances from 130 to 0.03 mL. The effect of removing the infrared portion of the flash radiance on the recovery times for a given level of visual performance was tested and found negligible. The other variables studied were the size of the flash field and the duration of the flash. The time course of recovery following various flash energies was investigated by varying the letter size and the letter luminances.

© 1965 Optical Society of America

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