Lecture 4 - Sensory Mechanisms-Updated

Behavioral eect on an individual of the same species

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Unformatted text preview: age of aqueous humor blocked and pressure inside eye rises, damaging re6nal cells •  10% of all cases of blindness in US –  Macular degenera6on: results in a loss of vision in the center of the visual field (macula) because of damage to the re6na •  25% of all cases of blindness in US –  Cataracts: accumula6on of protein clouds the lens •  Lens can be removed if required •  70% of people have cataracts by the age of 75 47 Photoreceptors  ­ Blindness •  Diabe6c re6nopathy –  result of microvascular re6nal changes –  overaccumula6on of glucose damage the blood vessels in the re6na –  blood vessels can bleed, cloud vision, and destroy the re6na –  affects up to 80 percent of all pa6ents who have had diabetes for 10 years or more 48 Photoreceptors  ­ Blindness •  Color vision problems may result from problems in genes producing cone pigments •  Red ­green color blindness most common and predominantly in men •  Lack or have abnormal red or green cone pigments •  Red and green opsin genes located on X chromosome 49 Photoreceptors  ­ Blindness 50 Photoreceptors  ­ Blindness Col...
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