Abstract
IN 1922, Pulfrich1 noticed that when a swinging pendulum bob is viewed binocularly with a neutral density filter over one eye the bob appears to describe an ellipse. The effect is caused by the extra delay associated with the lower illumination level in the filtered eye (Fig. 1). This promoted interest in finding the relation between visual delay and intensity.
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GUINN, T., KILMER, W., CRAIGHILL, E. et al. Human Rod Visual Delay. Nature 217, 185–187 (1968). https://doi.org/10.1038/217185a0
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DOI: https://doi.org/10.1038/217185a0
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