A repetition and extension of L. C. Thomson’s study of the influence of “light history” on the course of dark adaptation has confirmed the finding that a longer time is required to reach stable light adaptation than some writers have stated. The differences in scotopic sensitivity following two conditions of initial adaptation persisted until 15 or 20 min of a second light stimulus had intervened. The course of adaptation to the intervening light can be traced in terms of the time in dark required to reach a given level of sensitivity.
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