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17 Cards in this Set
- Front
- Back
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Where does light first enter (in the eye)?
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Cornea
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What is behind the cornea?
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Aqueous humor
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After the cornea what must light pass through?
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Iris. a muscle that expands and contracts and gives eye its color
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Where does the light go after it passes through the lense?
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Vitreous humor
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What is emmetropia?
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To focus light the aqueous and vitreous humor, the cornea, and the lens must all be perfectly matched to the lengths of the eyeball
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What is myopia?
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If the eyeball is too long the light will focus in front of the retina and the star will be blurry
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What is hyperopia?
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When light focuses behind the retina
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What is it called when the cornea is not spherical?
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astigmatism
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What are the 5 major classes of neurons in the retina?
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photoreceptors, horizontal cells, bipolar cells, amacrine cells, and ganglion cells
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What are horizontal cells?
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run perpendicular to the photoreceptors
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What are amacrine cells?
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cells found in the inner synaptic layer which makes synaptic contacts with bipolar cells, ganglion cells and one another.
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What are diffuse bipolar cells?
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receives input from as many as 50 photoreceptors, pools this info and passed it to a ganglion cell.
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What are midget bipolar cells?
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in the fovea, receive input from single cones and passes this info to a ganglion cell.
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What are ON midget bipolars?
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respond to increase in light
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What are OFF midget bipolars?
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response to decrease in light
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what are midget ganglion cells?
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small ganglion cells that receive excitatory input from midget bipolar cells in the central retina. (make up about 70% of the ganglion cells in retina)
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What are Parasol ganglion cells?
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(make up to 8-10% of the ganglion cells)are ganglion cells that looks like an umbrella and receives input from diffuse bipolar cells.
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