03.31 - Ross - Visual System

03.31 - Ross - Visual System - Retina Dr. William Ross...

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Retina •Dr. William Ross •Department of Physiology •Room 605 1 2 f = focal length d o = object distance d i = image distance Focal properties of a simple lens 3
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Lens system of the eye = cornea + lens 4 Optical properties of a typical relaxed eye 5 Controlled bilaterally Accommodation 6
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7 8 Change in accommodation with age 9
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Pupil Pupil control is bilateral Cholinergic parasympathetic fbers blocked by atropine 10 Photoreceptors in the eye 11 Photoreceptor distribution across the retina 12
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Sensitivity of vision and photoreceptors at diFerent wavelengths 13 Mosaic distribution of blue cones 14 Photoreceptor systems active at diFerent light levels 15
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scotopic photopic Relative visual acuity across the retina 16 The retina is thinnest in the foveal region 17 Typical vascularization of the retina 18
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photoreceptors ganglion cells periphery fovea ~1:1 ~120:1 Convergence is highest in the periphery 19 High acuity in fovea due to: •High density of thin cones •Thin, avascular retina
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This note was uploaded on 04/18/2008 for the course PHYS 1010 taught by Professor Thompson during the Fall '07 term at New York Medical College.

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03.31 - Ross - Visual System - Retina Dr. William Ross...

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