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Lecture 19

PSYC 211 Lecture 19: 19
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Department
Psychology
Course Code
PSYC 211
Professor
Yogita Chaudasama

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Description
Lecture #19 Anatomy on the Eye (I) - the cornea is the outer, front layer of the eye. It is transparent and admits light, sensitive to day time and night time - the iris is a pigmented ring of muscle - the lens consists of several transparent layers. The ciliary muscles can change the shape of the lens which increases the size of the pupil to allow the eye to focus depending on how much light the lens is letting the pupil take in, a process known as accommodation - the pupil regulates the amount of light entering the eye. It is an opening in the iris - the sclera is opaque and does not permit entry of light - conjunctiva is a mucous membranes that line the eye and merges with the inside if the eyelids Anatomy of the Eye (II) - the interior lining of the is the retina - photoreceptors called rods (sensitive to low light intensityà vision in the dark) and cones (essential for color vision, therefore useful in bright light and daytime vision) are located in the retina - light passed though the lens and crossed the vitreous humor, a clear, gelatinous fluid - the central region of the retina is the fovea. It contains the highest number of cones - site of blind spot is the point at which the optic nerve exists through the back of the eye. It has no receptors and therefore there is no vision The Route within the Retina - light passes through transparent cells and stimulate the photoreceptors located at the back of the eye - photoreceptors then send messages to bipolar and ganglion cells located closer to the center of the eye - the ganglion cells’ axons loop around each other and travel back to the brain - optic nerve is connected to the retina and is comprised of various number of cell bodies, retinas and photoreceptors - the receptors send their messages to bipolar and horizontal cells, which in turn send messages to the amacrine and ganglion cells. The axon
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