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目的从电生理学角度探讨立体视的机制,为客观检测立体视提供参数。方法由微机产生动态随机点立体图刺激,记录30名近距离立体视健康成年人4′～150′不同大小交叉和非交叉引起的视差诱发电位(disparity evoked potential,DEP)。结果 (1)不同视差的 DEP 均为宽大负正波;(2)45′交叉视差 DEP 的 N 波潜伏时最长,150′的 N 波潜伏时最短;4′和30′非交叉视差 DEP 的 N 波潜伏时最长,124′的 N 波潜伏时最短;(3)交叉视差 DEP 的 P 波振幅高峰出现在23′、60′及150′,非交叉视差 DEP 出现在15′、45′及72′;(4)各视差 DEP 的 N 波潜伏时、P 波振幅的非交叉视差变化曲线较交叉视差整体性左移;小视差的交差视差与非交差视差 DEP 的 N 波潜伏时演变规律不同。结论DEP 的 N 波潜伏时、P 波振幅能够为客观检测立体视提供参数;立体视宜分为精细交叉与精细非交叉、粗略交叉与粗略非交叉立体视。(中华眼科杂志,2006,42:878-882)
Objective To explore the mechanism of stereoscopic vision from the perspective of electrophysiology and to provide parameters for objectively detecting stereoscopic vision. Methods The computer generated a dynamic random point stereogram to stimulate and record the disparity evoked potentials (DEP) caused by cross and non-crossover of 4 ’~ 150’ different sizes in 30 brachytherapy adults. Results (1) The DEPs with different parallaxes were all large positive negative waves. (2) The 45-degree cross-parallax DEP had the longest N-wave latency and the shortest 150-N N-wave latency. The 4 ’and 30’ N wave longest latency, 124 ’N wave latency is the shortest; (3) cross parallax DEP P wave peak amplitude appears at 23’, 60 ’and 150’, non-cross parallax DEP at 15 ’, 45’ and 72). (4) The N-wave latency of each parallax DEP shows that the non-cross-parallax curve of P-wave amplitudes is shifted to the left of the cross-parallax. The evolution of N wave of Doppler shift is different from that of non-crossover parallax . Conclusions When N wave of DEP lurk, the amplitude of P wave can provide parameters for objectively detecting stereopsis. Stereoscopic can be divided into fine and fine non-crossover, coarse crossover and coarse non-crossover stereopsis. (Chinese Journal of Ophthalmology, 2006,42: 878-882)