Influence of VDT Work on Accommodative Function.

Yoo, Jin Seong; Yoon, Jung Woo; Kim, Jae Do

Original Article

Journal of the Korean Ophthalmological Society 1992;33(7):693-397.
Published online July 1, 1992.

Influence of VDT Work on Accommodative Function.

Jin Seong Yoo, Jung Woo Yoon, Jae Do Kim

Department of Ophthalmology, Catholic University Medical College, Seoul, Korea.

VDT 작업이 조절기능에 미치는 영향

유진성(Jin Seong Yoo),윤정우(Jung Woo Yoon),김재호(Jae Ho Kim)

Abstract

In order to observe the influence of visual display terminal (VDT) work on accommodative function, we measured accommodative power, accommodative constriction time and accommodative response / accommodative stimulus ratio (Ar / As) by infrared optometer on 15 normal subjects who were not exposed to VDT work before. VDT task was programed to search a specified Korean alphabet letter among randomized letters for 90 minutes. After VDT task, accommodative constriction time was prolonged, near point extended and accommodative power decreased in all subjects (p<0.05, by paired t-test). After resting for 30 minutes, constriction time, near point and accommodative power had a tendency to return to the previous normal value. Accommodative response / accommodative stimulus ratio (Ar / As) was decreased according to the duration of VDT work but no statistical difference was found between before and after VDT work. From this study, it is suggested that the function of accommodation seems to be affected by VDT work.

Key Words: Accommodative constriction time;Accommodative power;AriAs;Infrared optometer;Visual display terminal work