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photoreceptors click to hear : photoreceptors

Nerve cells of the retina that convert light into nerve impulses; these are transmitted to the brain, which decodes them and forms an image.
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rod cone

rod click to hear : rod

Photoreceptor active in dim light and responsible for night vision (in black and white).

cone click to hear : cone

Photoreceptor active in full light and responsible for perception of specific colors. There are three types: red-yellow, green and blue-violet.