Binocular vision is a complex faculty that requires the brain and both eyes working together to produce depth perception and clear vision. In some cases, the brain may favor one eye over the other. When this happens, the less-favored eye–usually the one with the poorest vision–may wander, causing the brain to further ignore its input. This condition is frequently referred to as amblyopia, or lazy eye. This condition must be treated, or it may result in permanent vision impairment.
According to the National Eye Institute, lazy eye affects up to 3 percent of children. It is usually discovered during routine checkups through simple vision tests. However, if your family has a history of childhood cataracts or crossed eyes, or if you notice one of your child’s eyes wandering while the other appears focused, you should contact your eye-care professional for an earlier evaluation.
For a complete vision test, you need to visit a health care provider, but you can conduct several simple tests at home. The most common eyesight test, the visual acuity test, measures your ability to see details at distances. The Amsler grid test checks whether you have a condition known as macular degeneration, which prevents you from seeing objects in the center of your visual field. The dominant-eye test determines which eye looks directly at objects. The non-dominant eye looks at objects at a slight angle, providing depth perception.
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Source: www.cdigg.com
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