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Abstract
The visibility of sinusoidally modulated gratings was measured psychophysically during 3 hours of exposure to either (i) a control, (ii) a warm-humid or (iii) a hot-dry atmosphere. No significant loss of contrast sensitivity in the heat conditions could be demonstrated for low spatial frequencies (≤ 3·0 c/deg) but an increasing loss with increasing frequencies (maximal above 10 c/deg). The heat-induced performance change appeared within 30min of exposure.