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29 Cards in this Set
- Front
- Back
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illuminance
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amount of light received by an object
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luminance
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amount of light emitted by an object
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albedo
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illuminance : luminance
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scopotic
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rods, low light
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mesopic
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threshold for cone vision, low light
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photopic
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cones, well lit
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cornea
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bends light
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lens
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fine tunes light bending
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aqueous humor
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nutrients
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vitreous homer
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maintains eye structure
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pupil
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focus, amount of light entry
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third eyelid
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sweeps debris
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optic disc
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where axons enter, blind spot
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near vision
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accomodation, refracting light to focus on retina, by parasymp (constricts pupils)
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far vision
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sympathetic, dilates pupils, flattens lens
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5 cell types for visual processing
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photoreceptor, bipolar, ganglion, amacrine, horizontal
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rods
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activated by rhodopsin, light converts retinal, closes Na ch, hyperpolarizes rod cell (disinhibition of bipolar cells causes transmission)
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convergence
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rods converge more than cones
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tapetum lucidum
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reflective layer behind retina, increases low light vision, decreases acuity
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color
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2 cone system common
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binocular vision
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stereopsis (depth perception), binocular summation
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monocular vision
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maximum field of view
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vision perception by:
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occipital + association cortices
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central processing
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optic nerve > lateral geniculate > optic radians > VI area of occipital cortex
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simple cells
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respond to lines at certain locations in visual field
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complex cells
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respond to edges/line orientations regardless of location
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menace response
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reflex blink after fast movement, CN II and VII
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dazzle reflex
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strong light causes eye closing, subcortical control
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pupillary reflex
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bilateral response caused by light, parasymp
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