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KMID : 1159320070090040451
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Korean Journal of Vision Science
2007 Volume.9 No. 4 p.451 ~ p.458
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Cast Study of Convergence Insufficiency in Vision Training
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Choi Sun-Mi
Lee Seong-Wook
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Abstract
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Convergence insufficiency is a common condition that is characterized by a person’s inability to maintain proper binocular eye alignment on objects as they approach from distance to near. There is typically an exophoria or intermittent exotropia at near, a receded near point of convergence, reduced positive fusional convergence amplitudes, and a low accommodation convergence/accommodation (AC/A) ratio.
The most common symptoms associated with convergence insufficiency include asthenopia and headache, diplopia [double vision], blurred vision.
The causes of convergence insufficiency are not completely clear. A connection has been made between accommodative insufficiency and convergence insufficiency. A significant exophoria at near with inadequate fusional convergence appears to be the primary underlying problem.
Vision training was prescribed during 6 weeks. There is an effective means of reducing symptoms, a increasing NPC, increasing positive fusional convergence amplitudes after vision training.
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KEYWORD
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Convergence insufficiency, Exophoria, Near Point of Convergence, Vision training
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