physiology of special senses
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| refractive power of a lens | measured in diopters; equals the reiprocal of the focal distance in meters
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| emmetropia | normal-light focuses on the retina
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| hypertropia | far sighter- light focuses behind the reitna and is correctid with a convex lens
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| myopia | near sighted-light focuses in front of the retina and is corrected with a biconcave lense
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| astigmatism | curvature of the lens is not uniform and is corrected with a cylindric lens
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| presbyopia | loss of accommodation power of the lens corrected with convex lens
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| pigment layer | contains melanin and absorbs stray light
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| photoreceptor layer | rods and cones
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| simple cells | respond to bars of light that have th correct position and orientation
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| complex cells | respond best to moving bars or edges of light with the correct orientation
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| hypercomplex cells | respond best to lines with particular length and to curves and angles
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