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Unformatted text preview: 3/27/12 1 Presbyopia: age related loss in accomodation: lens less elastic Light sensitive end Release Neurotransmitter Light Retina is built backwards Receptor cells (rods and cones) Bipolar cells (receptor to ganglion cells) Ganglion cells Send action potentials to brain Horizontal cells Amacrine cells LIGHT Fovea : Location of sharpest focus Unequal distribution of rods and cones All cones Clearer light path Innervation pattern (later) Fundus 3/27/12 2 Distribution of Rods and Cones Blind Spot: no receptors where axons leave the retina Acuity-Sensitivity Tradeoff Receptors Ganglion cells One-to-one; good acuity (fovea) Many-to-one (convergence); good sensitivity, poor acuity (rods off-fovea) Stimulus P vs M ganglion cells (see web activity) Rods Cones • Scotopic (low light) • Gray scale perception • Most sensitive to “green” light (500nm) • Low threshold • Slow dark adaptation • Photopic (bright light) • Color • 3 different types ( R G B ) – Together, peak sensitivity at...
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- Spring '12
- Photoreceptor cell, ganglion cells, ganglion cell