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PSL - Tweed - 2.docx

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Department
Physiology
Course
PSL300H1
Professor
All Professors
Semester
Fall

Description
ndPSL300 Fall 2013Tweed2 lecture Early visual processing Photoreceptors2 kinds of photoreceptor cells Most densely packed in macula and fovea Fovea is secondary visual angle have 200 000 receptors per mm squared density ConesOlder evolutionarily speaking Approximately 6 million per human retina Less sensitiveVision in bright light Do not work in dim light RodsEvolved from cones Approximately 120 million per human retina More sensitive detect single photons Only in low light In daylight rhodopsin is bleached out broken down But in dim light rods darkadapt and rebuild rhodopsin stores Liver has vitamin A used to make retinal a component of rhodopsinOtherwise night blindness Photoreceptors not distributed uniformly Fovea used for detailed vision No receptors in the blind spot where ganglioncell axons exist eyeball to form optic nerveFovea contains cones only Outside fovea proportion of rods increasesSee dim star better by looking slightly away from it so that m
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