Stiles-Crawford effect

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The differential effectiveness of light entering through the centre rather than through the edge of the pupil, bright light that is effective for cones and that is mediated by the photopic system being less effective when entering through the edge than the centre, but dim light effective for rods and mediated by the scotopic system not showing this differential effect. It is explained by the fact that cones have inner segments serving to channel light travelling directly down their axes, whereas rods are adapted to exploit every scrap of light that falls on them and do not have any channelling mechanism. [Named after the English physiologists Walter Stanley Stiles (1901–85) and Brian Hewison Crawford (1948–63) who discovered the effect in 1933]

Subjects: Psychology.

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