Lecture 4 - Sensory Mechanisms-Updated

Common and predominantly in men lack or have abnormal

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Unformatted text preview:  Vision •  Single ­lens eye –  Light passes through the transparent cornea, enters the eye through an opening called the pupil –  Iris: pigmented smooth muscle controlling size and therefore the amount of light that enters through the pupil –  2 cavi6es: •  anterior holds aqueous humor (Liquid is drained and blockage could cause glaucoma) •  posterior holds thick vitreous humor (maintains eye shape) 43 Photoreceptors  ­ Vision •  Single ­lens eye –  The light passes from the lens to the re6na –  The re6na contains the photoreceptors and other nerve cells that react to light s6muli 44 Photoreceptors  ­ Vision •  Some animals focus the light of the re6na by changing the shape of the lens •  Close object – ciliary muscles contract making lens more round and able to bend light rays more efficiently •  Distant object – ciliary muscles relax making lens more flat and reducing light rays bending 45 Photoreceptors  ­ Vision •  Binocular vision is the ability to combine images from both eyes to produce a single visual image •  Binocular vision allows for depth and distance percep6on –  humans and other mammals 46 Photoreceptors  ­ Blindness •  Visual disorders: 3 causes of vision loss –  Glaucoma: drain...
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This document was uploaded on 03/05/2014.

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