Yu M Z, Brown B
Department of Optometry and Radiography, Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Ophthalmic Physiol Opt. 1997 Jan;17(1):25-31.
We examined the variation of monocular pattern reversal topographic visually evoked potentials across a 13.6 degrees visual field and measured the parameters of the VEP waveforms in 37 locations across the field. Eighteen right and 20 left normal eyes were tested from 23 subjects. The mean response densities of the VEP decreased with increasing eccentricity; response densities are higher in the lower hemifield than in the corresponding mirror symmetric locations in the upper hemifield. The incidence of polarity reversal is higher in the upper hemifield, especially in more superior locations. The latency in the temporal field is shorter than that in the other locations. The coefficients of variations (CVs) of latencies are less than those of amplitudes in corresponding locations and the CVs of latencies of P1 and N2 components are less than those of the N1 component in corresponding locations. The CVs of amplitudes of the waveforms in mid-peripheral locations are larger than those of the other central areas. The parameters of the human topographic visually evoked potential are distributed regularly across the visual field and appear to reflect the underlying anatomy of the retina and visual cortex, and the placement of the recording electrode.
我们检查了单眼图形翻转地形图视觉诱发电位在13.6度视野范围内的变化，并在视野中的37个位置测量了VEP波形的参数。对23名受试者的18只右眼和20只左眼进行了测试。VEP的平均反应密度随离心率增加而降低；下半视野的反应密度高于上半视野相应镜像对称位置的反应密度。极性反转的发生率在上半视野较高，尤其是在更靠上的位置。颞侧视野的潜伏期比其他位置短。相应位置潜伏期的变异系数（CV）小于振幅的变异系数，且P1和N2成分潜伏期的CV小于相应位置N1成分的CV。中周部位置波形振幅的CV大于其他中央区域。人类地形图视觉诱发电位的参数在视野中呈规则分布，似乎反映了视网膜和视觉皮层的基础解剖结构以及记录电极的位置。
