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Effects of heat on visual acuity.

Visual acuity of nine subjects was measured with Landolt ‘C’s during 3 hours of exposure to either (i) a neutral control, (ii) a warm humid or (iii) a hot dry atmosphere. The luminance of the background was either 450cd/m2 or 5cd/m2. Simultaneously, rectal temperature and heart rate were recorded as indicators of thermal strain. A significant loss of visual acuity, linearly correlated with thermal strain, was found in both lighting conditions.