| http://www.w3.org/ns/prov#value | - Convergence insufficiency is a common binocular vision disorder characterized by asthenopia, eye fatigue and discomfort.[11] Asthenopia may be aggravated by close work and is thought by some to contribute to reading inefficiency.[6] In 2005, the Convergence Insufficiency Treatment Trial (CITT) published two large, randomized clinical studies examining the efficacy of orthoptic vision therapy in th
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