Contrast Visual Evoked Potentials under Pattern Stimulus in Ocular Trauma / 法医学杂志

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 (P0.05). 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 (P0.05). 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.