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17 Cards in this Set

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