Recent Developments in Vision Research (1966) / Chapter Skim
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CONCLUSIONS
CONCLUSIONS
Pages 77-79
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From page 77... ...
the pupillary threshold is lowered, and the contractions enhanced, when a small stimulus field is enlarged, and also when an already large field is further increased in extent; (d) the pupillomotor effectiveness of colored stimuli is related to their apparent brightness, with the peripheral retina far more sensitive to white,- green, or blue light than to red light; in other words, the pupillary spectral sensitivity curve for large fields resembles closely the human scotopic visibility curve.
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From page 78... ...
compared to the conditions after dark adaptation, red light has gained in effectiveness; in other words, the Purkinje shift exists for the pupil; and for small, centrally fixated fields, the pupillary spectral sensitivity curve agrees with the CIE photopic visibility curve and with the spectral sensitivity curve obtained by flicker fusion photometry under the same experimental conditions.1l (5) Animals with predominantly cone retinae, such as the pigeon or chicken, have vigorous pupillary reflexes, and these animals are more sensitive to red light and less sensitive to blue light than is the owl.
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From page 79... ...
Pupillary movements can be measured accurately in intact, conscious animals or man, without operative procedure of any kind. Because of their objective and functionally unequivocal nature, it is hoped that they may become increasingly useful indicators of retinal activity, as more refined and reliable instrumentation becomes available.
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