Near Point of Convergence of Normal Subjects and Convergence Insufficiency Patients.

Baek, C E; Kim, D S; Shin, J C

Original Article

Journal of the Korean Ophthalmological Society 1997;38(2):296-301.
Published online February 1, 1997.

Near Point of Convergence of Normal Subjects and Convergence Insufficiency Patients.

C E Baek, D S Kim, J C Shin

Department of Ophthalmology, College of Medicine, Hanyang University Hospital, Seoul, Korea.

정상인과 눈모음부족 환자에서의 눈모음근점

백창은(Baek C.E),김동섭(Kim D.S),신정철(Shin J.C)

Abstract

The near point of convergence (NPC) test is an indicator of the performance of near work. We measured the NPC to compare it between 251 normal subjects and 25 convergence insufficiency patients. The average NPC was 7.92 cm( objective: 7.11 cm, subjects, and 21.32 cm (objective: 17.31 cm, subjective: 25.33 cm) in convergence insufficiency patients, respectively. We experienced that the objective NPC was more shorter than the subjective NPC due to the effect of volutary convergence and that the average NPC of the convergence insufficiency patients was more remote than that of the normal subject, especially to be measured subjectively. Therefore, we suggest that the subjective NPC is more useful than the objective NPC to assess the maximum output of the vergence system, and have diagnostic and prognostic value in convergence insufficiency.

Key Words: Convergence insufficiency;Near point of convergence;Vergence