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An apparatus is described with which reflection spectra of the human fundus can be measured at the rate of 1·2 per sec. It is used to determine bleaching and regeneration characteristics of human foveal light-sensitive substances. Evidence is presented that at least two are present; products of bleaching can be detected. A cone-monochromat is shown to possess both the red- and green-sensitive pigments found in the normal fovea.
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R. A. Weale (1959) studied this question.
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