动态随机点立体视图检测正常人对不同速度水平运动立体视标分辨力

Stereoaccuracy of dynamic stereopsis perception of normal eyes with dynamic random dot stereograms in different speed

目的采用动态随机点立体视图研究正常人立体视功能与立体视标运动速度的关系。方法自身前后对照实验。选取2014年10月至2015年2月于中国医大四院眼科门诊就诊的患者中双眼视功能正常的志愿者30人，其中男13人，女17人，年龄20-29岁，平均（25．53±1．80）岁。使用自制动态立体图（dynamic rondom dot stereograms，DRDS）软件，在双眼最佳矫正状态下测定其对水平运动速度分别为60、90、120、150°／s（degree per second，DPS）的立体视标的分辨能力。对结果进行线性回归、x^2检验、非参数Man—Whitney—U检验统计学分析，P≤0．05为差异有统计学意义。结果对各组组平均立体视锐度进行线性回归分析，速度与立体功能呈负相关，R=0．982，对每个运动速度下通过各立体视锐度（弧秒）的人数进行非参数Man—Whitney—U检验，结果显示相邻组间差异有统计学意义（P〈0．05）。对60弧秒静态通过人数与各速度下通过人数进行，检验，结果显示60弧秒通过人数静态组与90、120、150DPS动态组差异有统计学意义（P〈0．05），与60DPS组差异不显著。结论正常人在水平运动动态随机点立体图实验（DRDS）中，视标沿水平轴以大于90DPS的速度运动时，动态立体视功能低于静态立体视功能正常值。且当双眼视差恒定且作为唯一信号时，人可以根据中央眼成像来识别运动中的物体，且立体视功能随立体视标运动速度增加而下降。

Objective To investigate the correlation between accuracy of dynamic stereopsis perception and the speed of stereo-image in x-axis with dynamic random dot stereograms （DRDS）. Methods In a before-after Trials, 30 patient （13 males, 17 females, averaged 25.53±1.80 years old） with normal binocular vision visited Ophthalmology Department of China Medical University were randomly recruited. The image discrimination thresholds of Dynamic random dot stereograms （DRDS） were assessed at 60, 90, 120, 150 degrees per second （DPS）. To analyze the results with linear regression, x2 test, nonparametric Man-Whitney-U inspection, P 〈0.05 was considered to be statistically significant. Results Calculated average stereoaccuracy of each group. In the linear regression analysis, speed and stereopsis ability were negatively correlated （R =0.982）. The number of each stereoaccuracy level in different speed with nonparametric was analyzed by Man-Whitney-U inspection, differences between adjacent groups had statistical significance （P 〈0.05）. Comparison static image with 90, 120, 150DPS using x2 test, the results showed that the 60 arc passing rate of static group and 90, 120, 90 DPS dynamic groups had statistically significant differences （P 〈0.05）, and with 60 DPS group, the difference was not significant. Conclusions At DRDS test in normal eyes, stereoaccuracy is lower than the normal average in static image when image moving at the rates that greater than 90DPS. People can recog-ize the objects in horizontal moving when binocular disparity is the only signal by cyclopia vision, in addition, the stereopsis ability and velocity are negatively correlated.