Me thods Threshold of stereopsis and the grade of the strabismus of the 85 cases with concomitant extropia were separately analyzed before and after the operation.

• 方法对85例外斜视应用同视机,立体视觉检查图及三棱镜分别进行术前、术后立体视觉阈值及斜视度检查,分析其结果。