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a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
the transparent structure behind the pupil that changes shape to help focus images on the retina
the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information
retinal receptor cells that are concentrated near the center of the retina and that function in daylight of well-lit conditions. These detect fine detail and give rise to color sensations
specialized cells which connect rods and cones to the ganglion cells of the optic nerve
the specialized cells which lie behind the bipolar cells whose axons form the optic nerve which takes the information to the brain
nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle or movement
visual theory that all colors can be made by mixing the three basic colors: red, green, and blue
images that occur when a visual sensation persists for a brief time even after the original stimulus is removed
opponent- process theory
the theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision.
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