外斜视动态随机点立体图刺激所引发的立体视觉诱发电位之特性

The stereoposis of exostrabismus applying self-produced dynamic random dot sterropsis

目的 :应用动态随机点立体图形刺激方法及VEP记录方法 ,了解外斜视患者动态随机点立体图刺激所引发的立体视觉诱发电位特性。方法 :应用自制的动态随机点立体图 (DRDS DynamicRandomDotStereop sis)做视刺激系统 ,记录 30例正常人及 2 7例外斜视患者双眼及单眼观察DRDS的立体视觉诱发电位 (VEP)。结果 :① 30例正常人在刺激双眼后均记录到一恒定的负正复合波 ,但在刺激单眼后均未记录到电位变化。②2 7例外斜视患者刺激双眼后和刺激单眼后均未记录到电位变化。结论 :在本实验条件下 ,以动态随机点立体图做视刺激所产生的VEP是由视差刺激所引起的特异性VEP ,可以认为这种DRDS刺激是测定立体视的有效刺激 ,是探讨立体视觉发生、发育的一种方法。外斜视患者虽然有双眼视及立体视存在 ,但其双眼视及立体视与正常人有一定的区别 ,特别是视皮层双眼信息加工中枢的不同信息反应 。

Objective:To use self produced dynamic random dot stereopsis for the objective assessment of stereopsis in exostrabismus patients before surgery.Methods:We presented self produced dynamic random dot stereopsis(DRDS), and recorded the VEP of 30 normal people and 27 people with exostrabismus while the subjects were viewing DRDS binocularly and monocularly.Results:①A constant negative positive compound wave was recorded in all 30 normal people when both eyes were stimulated. No potential difference was recorded when one eye was stimulated in this control group.②No potential difference was recorded in all 27 people with exostrabismus when one eye or both eyes were stimulated.Conclusion:DRDS stimulated VEP is specifically produced by retinal disparity. DRDS stimulation is an effective method for determining stereoscopic vision and for studying the incidence and development of stereoscopic vision. [FK(WB80011?6]