The deviation degree and visual function examination were performed by the synoptophore and prism pre- and post-operation in 128 concomitant strabismus patients.
对1 2 8例共同性斜视患者应用同视机、三棱镜分别进行术前、术后斜视度检查、视功能检查，分析结果。
The mean of post-test has improve by 8.6667 comparing to the pre-test, and the standard deviation of the post-test decreases, which implies students' average level improves.
后测的分数明显高于前测的分数，后测平均分比前测平均分高出8.667分，而且后测的标准差小于前测，说明学生的整体水平有了提高；
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