OldVis626 - Visual System Images projected from the visual field to the retina are inverted and reversed Upper visual field goes to the lower

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Visual System
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Images projected from the visual field to the retina are inverted and reversed. Upper visual field goes to the lower retina, lower visual field goes to the upper retina Right visual field projects to the left hemiretina in each eye, left visual field projects to the right hemiretina Central fixation point for each eye falls on the fovea where highest visual acuity occurs
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Fovea corresponds to the central 1-2 degrees of visual field. Half the fibers in the optic nerve originate there and half the neurons in the primary visual cortex process information from the fovea. Macual is an oval region 3 X 5 mm that surrounds the fovea and also has high visual acuity; macula occupies the central 5 deg of visual field. Optic disk is 15 deg nasal to the fovea. OD is where optic nerve fibers leave the back of the eye and so is the blind spot.
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2 photoreceptors: rods and cones Fovea is area of retina where inner layers are not present – higher acuity. Rod:Cone ratio is about 20:1, but cones predominate the macula/fovea. Rods function in low light and dominate peripheral vision. Cones dominate macula and function in color vision.
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Receptive field of neuron in the visual path is the portion of the visual field where light stimulation causes excitation or inhibition of the cell. Neuronal path in the retina starts with photoreceptors which project to bipolar cells which project to ganglion cells in the inner retinal layer. Ganglion cell axons make up the optic nerve.
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This note was uploaded on 08/24/2011 for the course MED 605 taught by Professor Skeen during the Fall '09 term at University of Delaware.

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OldVis626 - Visual System Images projected from the visual field to the retina are inverted and reversed Upper visual field goes to the lower

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