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目的观察正常眼对４△底向外三棱镜试验（４△ｂａｓｅ－ｏｕｔｐｒｉｓｍｔｅｓｔ）的反应类型及其对微小内斜鉴别诊断的价值。方法对正常组、屈光不正性弱视组、屈光参差性弱视组和微小内斜组共２７２例做４△底向外三棱镜试验检查，并对结果做统计学处理。结果正常组典型反应３１例（１６．０％），其余为不典型反应。微小内斜组漏诊率１０．５％，正常组、屈光不正性弱视组和屈光参差性弱视组误诊为微小内斜的比例分别为２．１％、７．９％和６６．７％。结论正常眼４△底向外三棱镜试验不典型反应比例很高，如掌握正确的观察和判断方法。４△底向外三棱镜试验对微小内斜的诊断有一定帮助，但４△底向外三棱镜试验不能区分微小内斜和屈光参差性弱视。
Objective To observe the type of reaction in normal eyes (4 △ base-outprism test) and its value in the differential diagnosis of minor oblique. Methods A total of 272 cases in normal group, ametropic amblyopia group, anisometropic amblyopia group and small internal oblique group were examined by 4 △ bottom out prism test, and the results were statistically analyzed. Results In the normal group, there were 31 typical reactions (16.0%), the rest were atypical reactions. The rate of misdiagnosis as minor esotropia was 10.5% in the minimally invasive group and 2.1%, 7.9% and 66.7% in the normal group, ametropic amblyopia group and anisometropic amblyopia group, respectively . Conclusions The proportion of typical atypical reactions in 4-out-going out-going prism test in normal eyes is very high. For example, we should master the correct observation and judgment methods. 4 △ out of the end of the prism test on the small oblique diagnosis of a certain help, but the 4 △ bottom out prism test can not distinguish between small and oblique anisometropia amblyopia.