Abstract
This report reviews a two-year investigation of problems related to the accurate judgment of size and distance as required of pilots in flight. The experiments covered a broad spectrum of psychophysiological issues involving the measurement of visual accommodation and its correlation with various other dependent variables. The latter included a short-term memory task, physiologicial measures of autonomic balance, scores on a personality test of introversion-extraversion, and responses to a personal inventory questionnaire. Psychophysiological issues investigated included the size-distance invarinace hypothesis, the moon illusion night and empty myopia, the dark focus and its so-called Mandelbaum effect, the nature and locus of the accommodative stimulus, and possible relationships among accommodative responses, autonomic balance, and personality. (Author)

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