Comparison of Rates of Dark Adaptation under Red Illumination and in Total Darkness, x
NAVAL MEDICAL RESEARCH INST BETHESDA MD
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Experiments were performed to determine whether or not red light is better than total darkness in accelerating dark adaptation. Light adapted subjects were intermittently exposed to red visual fields at three low intensity levels and their thresholds recorded after each exposure. Light adapted subjects were also exposed for twenty minutes to a red visual field of 0.3 millilamberts intensity followed by threshold measurements. Control tests in complete darkness run under identical conditions were paired with the red light exposure tests. Conclusions were drawn that no measurable accelerating action was found to result from exposure to red light. Thresholds obtained after red light exposure, are on the average higher than, or equal to, the corresponding thresholds following exposure to complete darkness.
- Anatomy and Physiology