All visual information passes through the retina, and the retina then communicates with higher centres of the brain through the optic nerve which consists of individual nerve fibres, each serving a different area of the visual field. Since the individual fibres of the optic nerve cannot accurately signal levels of activity over a range of more than one hundred to one, the retina must compress the very large range of intensities presented by the external world into a narrow range that can be adequately handled by the optic nerve fibres.
KeywordsVisual Acuity Outer Segment Bipolar Cell Amacrine Cell Visual Cell
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