visual purple


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visual purple:

see visionvision,
physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived. Vision in Humans

The human eye functions somewhat like a camera; that is, it receives and focuses light upon a photosensitive receiver, the retina.
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visual purple

[′vizh·ə·wəl ′pər·pəl]
(biochemistry)