Contrast sensitivity is the ability of the visual system to detect differences in luminance between an object and its background. This capability is crucial for perceiving shapes, edges, and textures, especially under varying lighting conditions. It is not just about seeing whether an object is there, but also how well one can distinguish it from its surroundings, which involves complex processing in the retina, lateral geniculate nucleus (LGN), and cortical areas of the brain.
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