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[摘要]
目的：研究眼外伤后189眼的视觉诱发电位资料，探讨将诱发电位技术应用于视力评估的可行性及方法。
方法：全部受检对象为志愿合作者，使用国际标准视力表对其视力随机筛查、盲测并分组，以刺激模式空间频率、P100波幅和潜伏期作为检测指标，探索最小空间频率，研究其与视力的对应关系，分析最小空间频率条件下P100波幅和潜伏期与视力的关系，确定应用视觉诱发电位技术评估视力的方法，比较受检眼的视力表筛查与视觉诱发电位评估结果。
结果：最小空间频率22'，11'，5'及3'所对应的视力分别为0.1～0.2，0.3～0.5，0.6～1.0及1.2～1.5，不同视力P100波幅存在显著性差异，而P100潜伏期却未表现出明显差异，结合最小空间频率及P100波幅对全部受检眼视力的视觉诱发电位随机评估，其结果与国际标准视力表筛查结果比较无显著性差异。
结论：应用视觉诱发电位技术可对志愿合作者的视力水平进行客观评估。
[Key word]
[Abstract]
AIM: To analyze the visual evoked potentials(VEP)of 189 eyes subjected to traumatic injury, and to explore the feasibility and method to applying VEP technology to the evaluation of visual acuity after eye trauma.
METHODS: All the objects were volunteers who were grouped according to a random examination with the international standard visual acuity chart. The study determined spatial frequency in stimulation mode, P100 amplitude and latency. Then, the lowest spatial frequency(LSF)was analyzed and its relationship with visual acuity were studied. Finally this study discussed about the way to evaluate visual acuity with VEP and also compared the VEP evaluation results with the visual acuity chart.
RESULTS: The LSF of 22', 11', 5', and 3' corresponded respectively to vision of 0.1-0.2, 0.3-0.5, 0.6-1.0, 1.2-1.5. There was a significant difference in P100 amplitude between eyes with different visual acuity, but there was no significant difference in P100 latency between these eyes. The random evaluation results of VEP combined with LSF and P100 amplitude were highly consistent with the results with international standard visual acuity chart.
CONCLUSION: It is practicable to evaluate these volunteers' visual acuity with the VEP technology.
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