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macular degeneration difference between wet and dry

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Macular Degeneration Causes Loss of Visual Acuity?

Age-related macular degeneration (AMD) is an eye disease that gradually destroys sharp central vision. It occurs in two formswet and dry. Although they may still have some vision, individuals afflicted with more advanced forms of the disease are often considered legally blind because their central vision is too blurred to accomplish tasks such as driving or reading. AMD, in either form, causes no pain.Dry and Wet CharacteristicsDry macular degeneration occurs when light-sensitive cells in the macula break down, causing blurred central vision. The macula is located on the retina, the light-sensitive region at the back of the eye that converts light into electrical impulses. Dry AMD is the more common form of the disease. In addition to blurring, another early signal of the disease is the presence of drusen. These yellow deposits under the retina do not cause AMD, however their presence indicates a greater chance of developing advanced dry of wet AMD. Dry AMD has three stages, characterized by an increasing number of drusen in each as well as worsening of vision. Advanced AMD is characterized by a breakdown of light-sensitive cells in tissue surrounding the retina.The growth of abnormal blood vessels behind the retina and under the macula causes wet AMD. Often, these blood vessels are fragile, leaking blood and fluid. Damage occurs quickly as blood and fluid cause the macula to be raised from its normal place within the eye. Unlike dry AMD, there are no stages of progression with wet AMD.Seeing wavy lines are an early symptom of wet AMD. A small blind spot, obstructing central vision, may also rapidly occur.Causes and Risk FactorsThe exact cause of AMD is unknown. The condition develops, however, as the eye ages. AMD is found most frequently in individuals over 60 years of age, although it can occur earlier. A family history of AMD also increases risk. Other factors that increase the risk of AMD are being Caucasian and female, smoking, obesity, high blood pressure, high cholesterol and a diet low in fruits and vegetables.DetectionA comprehensive eye exam that includes visual acuity, dilation and tonometry can detect AMD.