摘要
目的 探讨多焦图形视诱发电位在视野不同区域的分布特性。 方法 用 VERIS Science TM4.0电生理记录系统记录 14例正常人的多焦图形视诱发电位 (visual evoked potential,VEP)。刺激图形为带图形的飞镖盘 ,以伪随机二元 m-系列对 2 6°视野范围的 6 0个不同部位进行图形翻转刺激。电极安放采用枕部的双极记录。分析 2次反应的第 1片。把 6 0个小块的反应组合成不同的区域进行分析比较。 结果 上半视野和下半视野的多焦 VEP反应极性相反 ,上半视野 P1 波潜伏期较长 ,反应密度较低。随离心度增加 ,多焦 VEP反应密度降低。水平区域的多焦 VEP反应与垂直区域有不同。 结论 用多焦 VEP方法可以在短时间内记录到视野范围内多个不同部位的 VEP反应。视野不同区域的多焦 VEP各有其特点。
Objective To investigate the distribution properties of multifocal pattern visual evoked potential across visual field. Methods Multifocal pattern visual evoked potentials(VEP) of 14 normals were measured with VERIS Science TM 4.0. The visual stimuli were dart board 60 with patterns which consisted of 60 patches arranged in dart board configuration spanning a 26° visual field. The temporal modulation of each patch was controlled by a special type of pseudorandom sequence called binary m-sequence. The electrodes were placed at equal distances 2 cm inferior to and 2 cm superior to and straddling the inion . The first slice of the second order kernel for each stimulus patch was analysed. The 60 patches were grouped into several sectors. The summed responses of these sectors were analysed and compared. Results Compared with that of the lower hemifield, the polarity of the multifocal VEP of the upper hemifield was reverse, and the latency delayed, the response density decreased. With the eccentricity increased, the response density of the multifocal VEP decreased. The properties of the multifocal VEP of the horizontal sectors were different from that of the vertical sectors. Conclusion VEP of many locations within visual field could be recorded simultaneously in a short time with the method of mutifocal VEP. The multifocal VEP showed different properties in different sectors within visual field.
出处
《中华眼底病杂志》
CAS
CSCD
2001年第4期280-283,共4页
Chinese Journal of Ocular Fundus Diseases
