方法：水平共同性斜视347例，其中内斜视76例，男37例，女39例，平均年龄13.27±7.77岁； 外斜视271例，男131例，女140例，平均年龄15.43±8.42岁。分别以三棱镜加遮盖法(视远度数)和同视机进行斜视角测量。将数据输入SPSS 17.0软件行统计学处理。

结果：外斜视的客观斜视角与三棱镜度的换算值：1°=0.29^△～1.78^△，值大小与是否为间歇性斜视有关(P=0.001)。内斜视客观斜视角与三棱镜度的换算值：1°=2.01^△～2.15^△。

结论：外斜视客观斜视角与三棱镜度的差异表现为随斜视角的增加而增大； 内斜视客观斜视角与三棱镜度的差异表现为随斜视角的增加而变小。同视机检查镜筒内+7.00D球镜的安装、患者近感性集合的影响及三棱镜块本身的缺陷可能是造成差异的主要原因。

METHODS: There were 347 patients with horizontal concomitant strabismus involved, in which 76 patients were esotropia, 37 patients were male while 39 were female, with average age of 13.27±7.77 years old. There were 271 patients with exotropia, 131 cases were male while 140 were female, with average age of 15.43±8.42 years old. All the patients were examined by synoptophore and prism plus shaded strabismometry in a long distance of 6m. Datas were analyzed by SPSS 17.0.

RESULTS: In the exotropia patients, the conversions of circular degree(°)and prism degree(^△)were: 1°=0.29^△～1.78^△, which was statistically significant with intermittent strabismus(P=0.001). While in the esotropia patients, the conversions were: 1°=2.01^△～2.15^△.

CONCLUSION: The diversity between the two methods is enlarged with the increase of squint angle for exotropia patients. While in esotropia patients, the diversity decreased with the increase of squint angle. Synoptophore equipped with +7.00D, defects of the triple prism itself and proximal convergence during exam may be the reasons for the diversity.