Objective To explore a kind of visual evoked potential test equipment and method that is more suitable for the application of forensic clinical visual acuity evaluation. Methods Thirty-four volunteers （68 eyes） were selected, including 15 males and 19 females, aged between 20 and 40 years. Test lenses were placed before the tested eyes of volunteers to induce refractive myopia with insert method, and the diopter lenses were adjusted so that the visual acuity level of one eye of volunteers was above 0.8, and the visual acuity of the other eye was at moderate damage level （<0.3 and ≥0.1）. The tests were carried out under the binocular simultaneous asynchronous stimulation mode （hereinafter referred to as "binocular mode"） and monocular separate stimulation mode （hereinafter referred to as "monocular mode"） of virtual reality-pattern visual evoked potential （VR-PVEP）, and the amplitude of PVEP of volunteers under the two modes was compared at four spatial frequencies of 8×8, 16×16, 24×24 and 32×32. Results The differences in the amplitude of P100 wave between monocular and binocular modes at 8×8 spatial frequency had no statistical significance and the differences in amplitude of P100 wave between monocular and binocular modes at 16×16, 24×24, and 32×32 spatial frequencies had statistical significance （P<0.05）. The amplitude of the same eye in monocular mode was higher than that in binocular mode. Through correlation analysis, it was found that the amplitude of P100 wave in monocular mode was moderately correlated with amplitude of P100 wave in binocular mode. Conclusion In forensic identification practice, VR-PVEP is helpful for overcoming the disturbance of poor fixation, and to increase the reliability of PVEP evaluation results. It can greatly shorten the detection time of PVEP and improve work efficiency.
题目: 虚拟现实技术图像视诱发电位在法医学视力评定中的应用.
摘要: 目的 探索一种更切合法医临床视力评定应用需求的视诱发电位检查设备和方法。 方法 选取志愿受试者34例（68眼），其中男性15例，女性19例，年龄为20~40岁。采用插片法在受试者被检眼前放置试验透镜以诱导屈光性近视，调节受试眼屈光镜片度数，使受试者一眼视力水平在0.8以上，另一眼视力达中度损害水平（0.1≤视力<0.3），在虚拟现实技术图像视诱发电位（virtual reality-pattern visual evoked potential，VR-PVEP）的双眼同时不同步刺激模式（以下简称“双眼模式”）与单眼分别刺激模式（以下简称“单眼模式”）下进行检测，并在8×8、16×16、24×24、32×32 4种空间频率下对两种模式受试者PVEP的振幅进行比较。 结果 8×8空间频率下单眼模式与双眼模式P100波的振幅差异无统计学意义，16×16、24×24、32×32空间频率下单眼模式与双眼模式P100波的振幅差异均具有统计学意义（P<0.05），且同一眼在单眼模式下的振幅高于双眼模式下的振幅。通过相关性分析，发现各空间频率下单眼模式P100波振幅和双眼模式P100波振幅均呈中度相关。 结论 VR-PVEP在法医学鉴定实践中有助于克服受试者注视不良的干扰，增加PVEP评估结果的可信度，并可有效缩短PVEP的检查时间，提高检查效率。.
关键词: 法医学；虚拟现实；图像视诱发电位；视力；受试者.
Keywords: forensic medicine; virtual reality; pattern visual evoked potential; visual acuity; participants.
Copyright© by the Editorial Department of Journal of Forensic Medicine.