Effects of heat on visual acuity

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Abstract
Visual acuity of 9 subjects was measured with Landolt ''C''s during 3 h of exposure to either: a neutral control; a warm humid; or a hot dry atmosphere. The luminance of the background was either 450 cd/m2 or 5 cd/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.