注视程度对视诱发电位检查结果的影响

目的 探讨法医临床鉴定视诱发电位(visual evoked potential,VEP)检测中注视程度对结果的影响.方法 选取110名视力或矫正视力正常(视力范围为4.8～5.2)、年龄在20～30岁的受试者作为实验对象,分别进行图形视诱发电位(pattern visual evoked potential,PVEP...

Influence of visual attention in visual evoked potential examination

Objective To explore the influence of visual attention in visual evoked potential（VEP） examination.Methods The pattern visual evoked potential（PVEP） and flash visual evoked potential（FVEP） were used to examine 110 normal subjects whose visual acuity or corrected visual acuity is in the range of 4.8-5.2,and age between 20 to 30 years old.In PVEP inspection,subjects were asked to watch with three ways,to stare at the central screen（at the same time count silently the number of alternating of black and white squares to improve the subjects＇ attention）,to stare at the central screen at the same time thinking other things,to look sideways（the left eye stared at the left bottom corner of the screen or the right eye stared at the right one）.In FVEP inspection,subjects were checked with eyes open and closed respectively.The latency and amplitude of P100 wave were recorded.The data were statistically analyzed by SPSS 13.0 software.Results In PVEP inspection,the latency and amplitude of P100 wave were statistically different among three watching ways.In FVEP inspection,latency and amplitude of P100 wave were statistically different between eyes open and closed group.Conclusion Although the visual evoked potential test is an objective electrophysiological visual function test,it is susceptible to the influence of various subjective factors such as visual attention.It should arise the attention of forensic experts.