Contrast Visual Evoked Potentials under Pattern Stimulus in Ocular Trauma
10.3969/j.issn.1004-5619.2017.01.005
- VernacularTitle:眼损伤图形刺激对比度视诱发电位
- Author:
Meng WANG
;
Xiaoying YU
;
Jiemin CHEN
;
Ruijue LIU
;
Wentao XIA
- Keywords:
forensic m edicine;
eye injuries;
evoked potentials;
visual;
visually im paired persons
- From:Journal of Forensic Medicine
2017;33(1):21-24
- CountryChina
- Language:Chinese
-
Abstract:
Objective T o study the characteristic of contrast visual evoked potentials (C V E P ) in patients w ith ocular traum a. Methods Sixty patients defined as ocular traum a by forensic clinical exam ination in our center w ere selected, and split into 0.2-0.3 (G roup A ), 0.3-0.5 (G roup B ) and ≥0.5 (G roup C ) according to the best corrected visual acuity. T he variation characteristics of w ave am plitude and latency of C V E P under 100%, 25% and 10% contrast w ere observed and analyzed statistically. Results (1) U n-der the sam e contrast, the w ave am plitude of P 100 decreased w ith the decrease of stim ulus perspective. (2) U nder the sam e stim ulus perspective, the w ave am plitude of P100 decreased w ith the decrease of contrast (P<0.05). (3) U nder the contrast of 100% and 25% w ith the sam e stim ulus perspective (except 100% 7′ perspective stim ulus), the difference betw een group A and group B had no statistical signifi-cance (P>0.05). B etw een group A and group C , group B and group C , the w ave am plitude of P100 gradually increased w ith the increase of vision (P<0.05). U nder the contrast of 10% w ith 15′ stim ulus perspective, the w ave am plitude of P100 increased w ith the increase of vision (P<0.05). (4) U nder the sam e contrast w ith the sam e stim ulation perspective, the latency of P 100 w ave shortened w ith the increase of vision, w hile the difference had no statistical significance (P>0.05). U nder the sam e stim ulus per-spective, the latency of P100 w ave w as prolonged w ith the decrease of contrast (P>0.05). Conclusion C V E P m ay becom e one of the possible m ethods for the evaluation of contrast visual acuity.