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phys special senses

physiology of special senses

refractive power of a lens measured in diopters; equals the reiprocal of the focal distance in meters
emmetropia normal-light focuses on the retina
hypertropia far sighter- light focuses behind the reitna and is correctid with a convex lens
myopia near sighted-light focuses in front of the retina and is corrected with a biconcave lense
astigmatism curvature of the lens is not uniform and is corrected with a cylindric lens
presbyopia loss of accommodation power of the lens corrected with convex lens
pigment layer contains melanin and absorbs stray light
photoreceptor layer rods and cones
simple cells respond to bars of light that have th correct position and orientation
complex cells respond best to moving bars or edges of light with the correct orientation
hypercomplex cells respond best to lines with particular length and to curves and angles
Created by: swohlers