5. Visual - The Retina Fovea area of retina specialized for...

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The Retina
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Fovea –area of retina specialized for high visual acuity in the center of the macula; contains high density of cones
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There is no such thing as color in the physical world; there is simply a spectrum of visible wavelengths of light that are reflected by objects around us Colors are themselves “colored” by the brain, based on our subjective experiences
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The conversion of light into neural signals occurs in the photoreceptors Rods –greater number of disks and higher photopigment concentration à 1000 times more sensitive to light than cones Cones –responsible for our ability to see color contain one of three different photopigments Spectral sensitivities of the 3 types of cone pigments The brain assigns colors based on a comparison of the readout of the 3 cone types
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Regional Differences in Retinal Structure Peripheral Retina –much higher ratio of rods to cones –higher ratio of photoreceptors to ganglion cells So peripheral retina much more sensitive to low light levels Central Retina –cones only –low ratio of photoreceptors to ganglion cells –specialized for high resolution vision –fovea lateral displacement of cells above photoreceptors maximizes visual acuity no scattered light so no image blur
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Blind spot
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