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| energies from the world around us that affects us in some way |
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| light reflected from object passes through here,it adjusts to control the amount of light entering the eye |
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| colored structure on the surface of the eye surrounding pupil,where people decided eye color (i.e blue green brown eyes) |
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| a layer of visual receptors covering the back surface of the eyeball |
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| a rigid transparent structure always focuses light in the same way |
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| flexible structure that varies its thickness and enables the eye to accomodate that is to adjust its focus for objects at different distances |
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| central area of the human retina |
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| impaired ability to focus on nearby object because of decreased flexibility of the lens |
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| near sightedness -impaired ability to focus on distant object |
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| far sightedness -impaired ability to focus on close objects |
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| damage to the optic nerve,usually caused by increased pressure in the eyeball |
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| disorder where lens becomes cloudy. |
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| adapted for color vision daytime vision and detailed vision |
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| adapted for vision in dim light. |
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| gradual improvement in the ability to see in dim light |
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| whereas many rods converge their messages,where visual receptors send their impulses |
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| neurons in the eye that recieve input from bipolar cells,which in turn receive input from the visual receptors |
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| set of ganglion cell axons that turn around and exit the eye |
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| part of retina with no receptors because exiting axons take up all the space |
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color vision depends on the response rates of three types of cones
red( long wavelength) blue(short wavelength) green (medium wavelength) |
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| The Opponent-Process Theory |
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| we percieve color in terms of paired opposites red vs green,yellow vs blue,white vs green |
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| experiences of one color after the removal of another |
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| tendency of an object to appear nearly the same color under a variety of lighting conditions |
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| the cerebral cortex compares the patterns of light coming from different parts of the retina and synthesizes a color perception for each area. |
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| color blindness .. have one of the wavelength |
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| absolute sensory threshold |
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| instensity at which a given individual detects a stimulus 50% of the time |
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| study of people's tendencies to make hits,correct rejections,misses, and false alarms |
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