Visual Sensations Induced by Relativistic Pions

Abstract
Visual sensations were experienced when bursts of high-energy pions passed through the dark-adapted right eyes of 3 human subjects. The threshold for a visual sensation was typical 1-3 .mu.rad at the retina. Data are presented to show that the mechanism is Cerenkov radiation generated within the vitreous humor. Threshold measurements agree with published optical data. A comparison is made with the light flashes observed in deep space by Apollo astronauts.

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