Fast Facts of Common Eye Disorders. Minus Related Pages. Approximately 12 million people 40 years and over in the United States have vision impairment, including 1 million who are blind, 3 million who have vision impairment after correction, and 8 million who have vision impairment due to uncorrected refractive error. As of , 4. Approximately 6. Nearly 3 percent of children younger than 18 years are blind or visually impaired, defined as having trouble seeing even when wearing glasses or contact lenses.
However, safety experts and eye doctors believe the right eye protection can lessen the severity or even prevent 90 percent of these eye injuries external icon. This is sometimes referred to as "tunnel vision. Blurred Vision Blurred vision causes both near and far to appear to be out of focus, even with the best conventional spectacle correction possible. Generalized Haze Generalized haze causes the sensation of a film or glare that may extend over the entire viewing field.
In some cases, surgery may be required. For instance, cataracts are often treated by removing the clouded lens and replacing it with an intraocular lens an artificial plastic lens that requires no special care and restores vision. Other methods can compensate for vision loss.
Guide dogs can help people get from place to place independently. Braille allows those with visual impairment to read and write. Special equipment such as microscopic and telescopic glasses and voice-recognition software can make school and homework easier. Just as you don't think about your eye color every day, people with visual impairment don't always think about their condition every day either. Someone with sight problems can become isolated from others more easily, though.
If a visually impaired person asks for assistance, don't hesitate to help. But someone who uses a cane or a guide dog is probably self-sufficient and may not need help. Reviewed by: Jonathan H. Salvin, MD. Larger text size Large text size Regular text size. What Is Visual Impairment?
Conditions that may cause vision loss after birth include: Amblyopia pronounced: am-blee-OH-pee-uh is reduced vision in an eye caused by lack of use of that eye in early childhood. Some conditions cause a child's eyes to send different messages to the brain for example, one eye might focus better than the other. The brain may then turn off or suppress images from the weaker eye and vision from that eye then stops developing normally. This is also known as a "lazy eye.
Cataracts are cloudy areas in part or all of the lens of the eye. In people without cataracts, the lens is crystal clear and allows light to pass through and focus on the retina. Cataracts prevent light from easily passing through the lens, and this causes loss of vision.
Cataracts often form slowly and usually affect people in their 60s and 70s, but sometimes babies are born with congenital cataracts. Symptoms include double vision, cloudy or blurry vision, difficulty seeing in poorly lit spaces, and colors that seem faded.
Diabetic retinopathy pronounced: reh-ton-AH-pa-thee occurs when the tiny blood vessels in the retina are damaged due to diabetes.
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