目的：探讨直角三棱镜和等腰三棱镜测量斜视角的差异。

方法：病例对照研究，选取2021-06/2022-04我院住院共同性斜视患者176例，其中共同性内斜视患者79例，共同性外斜视患者97例。所有患者分别运用交替遮盖直角三棱镜和等腰三棱镜中和法进行斜视角测量。

结果：共同性内斜视患者直角三棱镜测量结果为49.167^△±13.573^△，等腰三棱镜测定结果为38.250^△±10.756^△(P<0.01)，两者差值为10.917^△±3.752^△； 直角三棱镜测量值转换为圆周度为19.096°±2.456°，等腰三棱镜为20.847°±5.364°(P<0.05)，两者差值为2.443°±2.702°； 共同性外斜视患者直角三棱镜测量结果为51.875^△±13.567^△，等腰三棱镜测量结果为40.492^△±11.753^△(P<0.01)，两者差值为11.383^△±4.783^△； 直角三棱镜测量值转换为圆周度为19.589°±2.521°，等腰三棱镜为21.947°±5.864°(P<0.01)，两者差值为3.200°±3.077°。两种类型斜视患者使用不同三棱镜检测结果差值及转化为圆周度比较均无差异(P>0.05)。

结论：直角三棱镜和等腰三棱镜查斜视角存在差别，直角三棱镜测定的斜视度大于等腰三棱镜。

METHODS: Case control study. A total of 176 cases of concomitant strabismus admitted to our hospital from June 2021 to April 2022 were selected, among which 79 cases were concomitant esotropia and 97 cases were concomitant exotropia. The squint angle of all patients was measured respectively by alternating cover right angle prism and isosceles angle prism.

RESULT: For patients with concomitant esotropia, the right angle prism degree was 49.167^△±13.573^△ and the isosceles angle prism degree was 38.250^△±10.756^△ (P<0.01), with a difference of 10.917^△±3.752^△; the measurement of right angle prism converted to circular degree was 19.096°±2.456°, and the isosceles angle prism value was 20.847°±5.364°(P<0.05), with a difference of 2.443°±2.702°. For patients with concomitant exotropia, the right angle prism degree was 51.875^△±13.567^△, and the isosceles angle prism degree was 40.492^△±11.753^△ (P<0.01), with a difference of 11.383^△±4.783^△; the measurement of right angle prism converted to circular degree was 19.589°±2.521°, and the isosceles angle prism value was 21.947°±5.864°(P<0.01), with a difference of 3.200°±3.077°. There was no significant statistical difference in the differences of the two prism degree and the circular degree for concomitant esotropia and concomitant exotropia(P>0.05).

CONCLUSIONS: The squint angle measured by different shaped prisms is different. The degree measured by right angle prism is larger than that by isosceles angle prism.