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Convergence insufficiency is a near vision problem that interferes with a person's ability to see, read, learn, and/or work at close distances. It is an eye teaming problem in which the eyes have a strong tendency to drift outward when doing sustained close work such as reading. This can result in double vision. To prevent double vision, one has to exert more effort to keep the eyes aligned and teamed. This exertion causes eyestrain, headaches, blurred or double vision, sleepiness, movement of print while reading, loss of comprehension while reading, and difficulty concentrating.
Treatments of convergence insufficiency include prism eyeglasses, pencil push ups, surgery, and/or vision therapy. Prism eyeglasses are not a "cure" but can eliminate or diminish some of the symptoms. Pencil push ups have been shown to be ineffective, and surgery should be considered as a last resort. Office based vision therapy has been shown to be the most effective treatment for convergence insufficiency.