Cars Essay

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Brenda Deckman Practicum Assignment #2 March 9th 2004 Human Aging Diseases and Disabilities Body System: Sensory/Visual Organ: Eyes Disease/Disability: Cataracts Definition: A Cataract is a clouding of the crystalline lens of the eye that prevents clear passage of light through the lens. The size and density of the cataract can vary greatly, so the effect on vision will also vary greatly. The closer the cataract is to the center of the pupil the more the vision will be impaired. The more to the side of the lens the clouding is, the less severe the symptoms will be. Often the clouding is fairly equal throughout the lens. Symptoms: The most common symptom of a cataract is blurred vision. It is most noticeable when driving a car or reading. The vision may be cloudy, filmy or fuzzy. Because the lens is not crystal clear the light entering the eye is scattered. This makes focusing on the retina difficult. Sometimes a person with a cataract sees double. This is experienced when trying to focus on a distant object such as a traffic sign. Glare is also a symptom of a cataract. A person may see halos around lights at night which can make driving difficult, and bright sunlight can also be very irritating. Depth perception, the ability to judge distance may also be affected. Good depth perception requires the use of both eyes, and since a cataract usually develops in one eye at a time, a person may favor the better eye. When one eye is favored the eyes are not working together which in turn affects depth perception. Changes in the way colors are seen can also be a symptom of a cataract. It may seem as if the world has been painted gray. Certain shades of

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