Influence of high ambient temperature and humidity on visual sensitivity

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Abstract
The visibility of sinusoidally modulated gratings was measured psychophysically [in humans] during 3 h of exposure to either a control, a warm-humid or a hot-dry atmosphere. No significant loss of contrast sensitivity in the heat conditions could be demonstrated for low spatial frequencies (.ltoreq. 3.0 c[candles]/deg) but an increasing loss with increasing frequencies (maximal above 10 c/deg). The heat-induced performance change appeared within 30 min of exposure.