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目的探讨空间频率扫描翻转图像视觉诱发电位视力(SPVER-A)检查在法医学客观评定视敏度中的价值。方法选取正常眼共40只眼(矫正视力均≥4.9),分别测试行为视力(主观视力)及SPVER-A(客观视力),将客观视力、主观视力的数值进行对比及统计学分析。结果 (1)40只眼SPVER-A得出的客观视力的均值(x—)4.96,标准差(s)0.08,变异系数(CV)0.02;(2)40只眼的SPVER-A的客观视力(Visus值)与主观视力值的相关性(r=0.7097);(3)40只眼的客观视力数值均等于或低于主观视力数值。其中差值≤0.1者为39只眼,达到了97.5%,只有一只眼的客观视力数值与主观视力数值差值大于>0.1。结论在正常眼人群中,SPVER-A所得客观视力与主观视力值有良好的相关性,是法医学客观评定视敏度极具潜力的新方法之一。
Objective To investigate the value of space-frequency scan-inverted image visual evoked potential visual acuity (SPVER-A) in objective assessment of visual acuity in forensic medicine. Methods A total of 40 normal eyes (corrected visual acuity≥4.9) were selected. The behavioral acuity (subjective visual acuity) and SPVER-A (objective visual acuity) were measured. The objective acuity and subjective visual acuity were compared and statistically analyzed. Results (1) The average visual acuity (SPX) of 40 eyes was 4.96, the standard deviation (s) was 0.08, and the coefficient of variation (CV) was 0.02. (2) Objective visual acuity of SPVER-A in 40 eyes (Visus value) and subjective visual acuity (r = 0.7097). (3) The objective acuity values of 40 eyes were all equal to or lower than the subjective acuity values. Among them, the difference value ≤0.1 was 39 eyes, reaching 97.5%. Only one eye had the difference between objective visual value and subjective visual value more than> 0.1. Conclusion In normal eyes, there is a good correlation between the objective visual acuity obtained by SPVER-A and the subjective visual acuity, which is one of the new methods for forensic science to objectively evaluate visual acuity.