What most everyone calls double vision, medical experts call diplopia or convergence insufficiency, a pathological vision disorder that causes a single object to blur or appear doubled. The eyes of people with diplopia do not work together when looking at nearby objects. One eye turns outward rather than inward in concert with the other eye, which creates the double or blurred vision. Children are most often diagnosed with diplopia while in school because they tend to begin noticing it when reading. Often, diplopia is a symptom of a larger condition.
The signs and symptoms of diplopia usually happen when a person is reading or doing close-up work. At first, the person may complain of tired or sore eyes, describing eyestrain. Headaches often accompany problems with the eyes. When reading, the words may seem to float on the page, and the individual may have difficulty concentrating. Sometimes, children are incorrectly diagnosed with a reading problem as opposed to a vision problem.
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