The Effect of Caffeine on Human Dark Adaptation.
NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
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The consumption of caffeine by naval personnel in the operational environment is extensive and frequent. In particular, pilots, aircrewmen, watchstanders, and drivers often consume coffee prior to their performance of missions or tasks at night. The present two experiments were designed to investigate the effects of caffeine upon the absolute detection thresholds during dark adaptation. Within certain subjects caffeine consumption resulted in lower detection thresholds. The caffeine enhancement effect was significant only during the portion of dark adaptation following the rod-cone break. No evidence was found for a detrimental effect of caffeine on dark adaptation. Author