How far away is your finger b optics of the eye b

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How far away is your finger? B. Optics of the eye B. Optics of the eye: Lens correction for hyperopia (far-sighted) Tutis villis ( )
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4/8/2013 4 Concave lens Convex lens More animated demonstrations of lens accommodation: B. Optics of the eye: spatial organization Layout of information on retina is like the camera obscura
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4/8/2013 5 B. Optics of the eye: visual angle Receptive field: the region on the retina in which visual stimuli influence a neuron’s firing rate. Optic Nerve: Blind spot and filling in Macula, center is fovea = cones Optic nerve (blind spot), where axons of ganglion cells exit eye Optic Nerve: Blind spot and filling in Fixate the 3, move back and forth until yellow dot disappears. Fixate other numbers and repeat B. Optics of the Eye: Summary Lens accommodation occurs to focus light on the retina. Eye glasses are used to correct failures of accommodation The retina is the membrane at back of eye with of photoreceptors. Spatial information from the world is preserved on the retina. The optic nerve is where the axons of the ganglion cells exit and there are no photoreceptors. This creates a blind spot.
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4/8/2013 6 C. Retina Retina contains light sensitive cells, which convert light to electrical activity that is sent to the brain (transduction). C: Retina: Rods and Cones Transduction occurs when 1 photon of light is absorbed by a light sensitive molecule. This produces an enzyme cascade that reduces release of glutamate and signals that light has been captured to the bipolar cells. C: Duplex Retina: Rods and Cones Two types of photoreceptors. Have different visual pigments that are sensitive to different wavelengths of light Rods Rhodopsin Can respond to 1 photon Scotopic (dim) illumination More dense in peripheral retina Cones 3 pigments sensitive to long, medium, and short wavelengths (will be important for color vision) Requires greater number of photons to respond Photopic (bright) illumination More dense in fovea C: Retina: Rods and Cones: Density
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4/8/2013 7 C. Retina: Rods and Cones: Diseases: Age-related macular
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  • Winter '07
  • D.Whitney
  • Light, dark adaptation, B. Optics, C. Retina

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