Contrast Visual Evoked Potentials under Pattern Stimulus in Ocular Trauma.
10.3969/j.issn.1004-5619.2017.01.005
- Author:
Meng WANG
1
;
Xiao Ying YU
1
;
Jie Min CHEN
1
;
Rui Jue LIU
1
;
Wen Tao XIA
1
Author Information
1. Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Institute of Forensic Science, Ministry of Justice, PRC, Shanghai 200063, China.
- Publication Type:Journal Article
- Keywords:
evoked potentials, visual;
eye injuries;
forensic medicine;
visually impaired persons
- MeSH:
Evoked Potentials, Visual/physiology*;
Eye Injuries/physiopathology*;
Humans;
Pattern Recognition, Visual/physiology*;
Photic Stimulation;
Vision, Ocular;
Visual Acuity
- From:
Journal of Forensic Medicine
2017;33(1):21-24
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVES:To study the characteristic of contrast visual evoked potentials （CVEP） in patients with ocular trauma.
METHODS:Sixty patients defined as ocular trauma by forensic clinical examination in our center were selected, and split into 0.2-0.3 （Group A）, 0.3-0.5 （Group B） and ≥0.5 （Group C） according to the best corrected visual acuity. The variation characteristics of wave amplitude and latency of CVEP under 100%, 25% and 10% contrast were observed and analyzed statistically.
RESULTS:（1） Under the same contrast, the wave amplitude of P₁₀₀ decreased with the decrease of stimulus perspective. （2） Under the same stimulus perspective, the wave amplitude of P₁₀₀ decreased with the decrease of contrast （P<0.05）. （3） Under the contrast of 100% and 25% with the same stimulus perspective （except 100% 7' perspective stimulus）, the difference between group A and group B had no statistical significance （P>0.05）. Between group A and group C, group B and group C, the wave amplitude of P₁₀₀ gradually increased with the increase of vision （P<0.05）. Under the contrast of 10% with 15' stimulus perspective, the wave amplitude of P₁₀₀ increased with the increase of vision （P<0.05）. （4） Under the same contrast with the same stimulation perspective, the latency of P₁₀₀ wave shortened with the increase of vision, while the difference had no statistical significance （P>0.05）. Under the same stimulus perspective, the latency of P₁₀₀ wave was prolonged with the decrease of contrast （P>0.05）.
CONCLUSIONS:CVEP may become one of the possible methods for the evaluation of contrast visual acuity.
