采用深度觉测试仪结合心理物理法对精神发育迟滞儿童和正常儿童进行了不同距离的测试比较.结果患儿组单双眼深度辨别能力低于对照组,辨别阈值则明显高于对照组.远距测试患儿组反应特点以随意性误判断增多为主.近距测试则以中性不肯定判断增多为主。判断成绩与两组被试的性别及年龄差别无关.患儿组寻找和利用深度觉线索方面存在着缺陷.并对以上反应特征进行了讨论. The distance between the mental retardation children and the normal children was measured and compared by using the depth perception test instrument and the psychophysical method.Results The discrimination ability of the depth of single and double eyes in children was lower than that of the control group and the discrimination threshold was significantly higher than that of the control group The response characteristics of children in the test group were mainly random errors, while the short-range tests were mainly based on the increase of neutrality and not sure judgment. Judgment grade has nothing to do with gender and age differences of the two groups.The deficiencies in the children’s group in finding and using the deep sense cues are discussed.The characteristics of the above reactions are discussed.