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| convergence insufficiency ： ウィキペディア英語版 |
convergence insufficiency
Convergence insufficiency or convergence disorder is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the eyes to turn towards each other, or sustain convergence.
==Symptoms==
The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue,
headache, and abnormal postural adaptation, among others.
Note that some Internet resources confuse convergence and divergence dysfunction, reversing them.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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