Changes of Transient and Steady VEP by Checkboard Contrast.
- Author:
Jeong Ik CHO
1
;
Chung Woo KIM
;
Min Cheol SHIN
;
In Won PARK
Author Information
1. Department of Ophthalmology, Kangdong Sacred Heart Hospital, College of Meclicinl Hallyme University, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Contrast;
YEP
- From:Journal of the Korean Ophthalmological Society
1992;33(5):526-532
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
We measured the changes of each component of YEP by increase in contrast 8%, 30%, 60%, 90%, 98% in small checkerboard pattern stimuli and large checkerboard pattern stimuli in 10 normal subjects (20 eyes) in order to get basic data for utilizing YEP according to changes of contrast in clinical diseases group, N1 latency and P1 latency were notably shortened from 30% to 60%. N2 latency was extremely shortened from 60% to 90%. N1-P1 amplitude and P1-N2 amplitude were remarkably increased from 30% to 60%. The amplitude of steady YEP generally increased as the contrast was increased. Immatured YEP wave was turned to matured YEP wave between contrast 30% and 60%. Threfore, when we apply YEP with to lower contrast of stimuli clinical cases, the appropriate range of contrast is from 30% to 60%.
