VEP in Normal Eyes by Using Different Check-sizes.

Park, Tae Yong; Kim, Ki San

Original Article

Journal of the Korean Ophthalmological Society 1987;28(3):539-544.
Published online March 1, 1987.

VEP in Normal Eyes by Using Different Check-sizes.

Tae Yong Park, Ki San Kim

Department of Ophthalmology, Capital Armed Forces General Hospital, Seoul, Korea.

정상안에서 Check - size 에 따른 VEP 변화

박태용(Tae Yong Park),김기산(Ki San Kim)

Abstract

VEP is a gross electrical signal generated by the occipital region of the cortex in response to visual stimuli and it is useful in refraction, optic nerve disease, color blindness, amblyopia, field defect, macular disease, etc. We used Horizon computer with UTAS-E and normal VEP at different checksize was measured on 30 subjects(60 eyes) with visual acuity better than 1.0. The pattern reversal frequency was 2 Hz., analysis time was 250 msec., artifact reject threshold was 75 micro V., low-pass filter cut-off was 30Hz., high-pass filter cut-off was 1Hz. The check sizes used were 16 X 16(50min), 32 X 32(25min) and 64 X 64(12.5min). The results were as follows; 1. 16 X 16 (50min). amplitude: 8.18 +/- 3.55 micro V., latency: 106.78 +/- 4.28 msec. 2. 32 X 32(25min). amplitude: 8.48 +/- 5.99 micro V., latency: 106.68 +/- 3.82 msec. 3. 64 X 64(12.5min). amplitude: 7.79 +/- 3.68 micro V., latency: 109.73 +/- 5.15 msec. 4. The change of latency between 32 X 32 and 64 X 64 check-size was statistically significant(p<0.05). 5. The amplitude was largest in 32 X 32(25min.) check-size but statistically not significant(p>0.05). 6. The latency was most increased in 64 X 64(12.5min.) check-size and it was statistically significant(p<0.001).