폭주부족은 원방에서 근방을 주시할 때 양안을 정렬할 수 없는 현상이다. 일반적으로 근거 .리에서 외사위나 간헐성 외사시, 폭주근점 저하, 양성 융합 폭주력 저하, 낮은 AC/A 비에서 나타난다. 증상으로는 안정피로, 두통, 복시, 흐림 등이 나타난다. 폭주부족의 원인은 명확하지 않지만 조절부족과 관련이 있다. 근본적인 문제는 근거리에서 융합성 폭주가 부족하고 강한 외사위가 있는 경우이다. 시기능 훈련은 6주간 실시하였다. 훈련 실시 후에 자각증상들이 감소하였고 폭주근점이 증가하였으며 양성 융합 폭주력도 증가하였다.

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.

• 최선미(전북과학대학 안경광학과) | Sun-Mi Choi
• 이성욱(광양보건대학 안경광학과) | Seong-Wook Lee