vision - VISION February 28, 2008 Parts of the eye: o Pupil...

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VISION February 28, 2008 Parts of the eye: o Pupil = iris (colored part)(muscle) regulates opening. bright light = closed, dark = open o Lens = focus the light o Retina = back of the eyeball; contains 2 kinds of cells Cones – 6 million – bright light, color, detail Rods – 120 million – helping see in the dark o Fovea = center of the retina, has only cones, is the region of maximum visual acuity o Sensory receptors (rods and cones) translates light into neural impulses, connect with  bipolar cells, then ganglion cells. Axon are bundled together and leave retina at optic disk  (blind spot) o The optic nerve carries impulses from the retina to the brain o Fibers cross at the optic chiasm, go to the thalamus and then the primary visual cortex o Some cells here are specialized o Adaptation: dark and light Vision problems: o Myopia – far items blurred (nearsighted)
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This note was uploaded on 04/09/2008 for the course BIO 101 taught by Professor Takchung during the Spring '08 term at Illinois State.

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vision - VISION February 28, 2008 Parts of the eye: o Pupil...

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