RESUMEN
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.
RESUMEN
Objective To find the correlation between real best corrected visual acuity (BCVA) and test-ing results of microperimetry and visual evoked potential (VEP) and to explore a newmethod in record-ing BCVAin macular disease. Methods Sixty-two patients with macular disease (macular disease group, 62 eyes) and eighteen healthy volunteers (control group, 36 eyes) had BCVA, microperimetry and VEP recorded. Results (1) By microperimetry, the values of retinal mean sensitivity and fixation percentage in macular disease group were lower than that in control group. The bicurve ellipse area in macular dis-ease group was higher than that in control group. By V EP, P100 amplitude under 0.5 cpd and 2 cpd in macular disease group were significantly higher than that in control group and the latency was prolonged (P<0.05). (2) In macular disease group, BCVAhad significant positive correlation with retinal mean sen-sitivity, bicurve ellipse area, macular central 2°and 4°fixation percentage, respectively (P<0.05). There was a significant correlation between retinal mean sensitivity and P100 amplitude (P<0.05). (3) multiple linear regression equation was y=0.053 x1+0.008 x3+3.897 (y was BCVA, while x1 was retinal mean sensi-tivity and x3 was P100 amplitude under 2 cpd). Conclusion C ombined use of microperimetry and VEP is useful in the assessment of BCVAin macular disease.