Objective: To study the correlations between the distance stereoacuity and the levels of control at different far distance fixations in children with intermittent exotropia. Methods: In this prospective, non-interventional case series study, 52 children with intermittent exotropia (basic, divergence excess and pseudo-divergence excess types, exodeviation angles≥15 PD) admitted to the Shandong Provincial Hospital Affiliated to Shandong University for surgery between August 2014 and March 2015 were enrolled. The distance stereoacuity was tested with the distance Randot stereotest, and the control of exodeviation was assessed at outdoor far distance fixation of 50 m, indoor far distance fixation of 30 m, and indoor distance fixation of 3 m, respectively, using the office-based 6-point control scale proposed by Mohney and Holmes. The distance stereoacuity and control scores of every intermittent exotropia child were tested 3-4 times in a single day with an interval of at least 2 hours. Nonparametric Spearman rank method was used to analyze the correlations between distance stereoacuity and levels of control at three different far distances in children with intermittent exotropia. Results: The mean age of 52 enrolled children (26 males, 26 females) was 7 years (range, 5-12 years), and 192 groups of distance stereoacuity and control scores were got for the 52 children. Positive correlations between the distance stereoacuity and the levels of control at outdoor far distance fixation of 50 m, indoor far distance fixation of 30 m, and indoor distance fixation of 3 m were observed (coefficients of correlations; r=0.489, 0.472, 0.282, all P<0.001). Conclusion: There are correlations between the distance stereoacuity and the levels of control at outdoor far distance fixation of 50 m, indoor far distance fixation of 30 m and indoor distance fixation of 3 m in children with intermittent exotropia, and the former two are found to be stronger than the latter one. (Chin J Ophthalmol, 2019, 55:25-30).
目的： 探讨间歇性外斜视儿童远立体视锐度与注视不同远距离视标时的外斜视控制力分级的相关性。 方法： 前瞻性、非干预性研究。对2014年8月至2015年3月在山东大学附属省立医院眼科住院拟行手术治疗的52例间歇性外斜视（基本型、外展过强型和类似外展过强型；看远斜视度数≥15 PD）儿童进行远立体视锐度测定和看远外斜视控制力的评估。远立体视锐度测定采用Randot远立体视觉检查图。外斜视控制力评估采用Mohney和Holmes六分级法，按照由远距离视标到近距离视标的顺序分别对受试儿童注视户外50 m、室内30 m、室内3 m不同远距离视标时的外斜视控制力进行分级。每例受试患儿在同一天内进行远立体视锐度和控制力分级测量3或4次，2次测量间隔不小于2 h。采用Spearman相关性分析对受试儿童的远立体视锐度与注视3个不同远距离视标的外斜视控制力分级的相关性进行分析。 结果： 52例受试间歇性外斜视儿童中男性26例，女性26例；平均年龄7岁（5~12岁），共测得192例次远立体视锐度和各注视距离控制力分级结果。间歇性外斜视儿童的远立体视锐度与注视户外50 m、室内30 m、室内3 m视标时外斜视控制力分级的相关系数r分别为0.489（P<0.001）、0.472（P<0.001）、0.282（P<0.001），间歇性外斜视儿童远立体视锐度与注视3个不同远距离视标的外斜视控制力分级均呈正相关。 结论： 间歇性外斜视儿童的远立体视锐度与注视户外50 m、室内30 m和室内3 m视标时的外斜视控制力分级均有相关性，且前两者较后者更强。（中华眼科杂志，2019，55：25-30）.
Keywords: Depth perception; Exotropia; Fixation, ocular; Visual acuity.