ANAT 321 Lecture Notes - Lecture 15: Outer Nuclear Layer, Retinal Detachment, Retinal Pigment Epithelium

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Electromagnetic radiation corresponding to visual field is absorbed by retina discretely disassembled into cells reassembled in higher levels into coherent. Diff components of image processed by diff parts of brain (e. g. movement, colour) Most focusing does cornea, some by lens (lens changes shape, allows change focus) Regulate how much light passes (visual system can detect 12 orders of magnitude of light intensity) Smaller pupil better optic properties, easier to focus. Outer layer: white eye, sclera (tough tissue) continuation of dura matter, goes down optic nerve, part of cns. Choroid filled w/dark pigment to absorb light bouncing around. Optic disc: convergence of all axons from retinal ganglia cells, form optic nerve to brain. Has no photoreceptors, completely insensitive to light; blind. Light through eyes focused mainly on small region of retina. Fovea: small depression in macula, where light focused, centre of visual field. Focus constantly shifting around; if looking at face mostly preoccupied on eyes/nose/mouth.

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