Variability of stereoacuity in intermittent exotropia
Variability of stereoacuity in intermittent exotropia
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DOI：
10.1016/j.ajo.2007.10.028
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发表时间：
2008-03-01
影响因子：
4.2
通讯作者：
Holmes, Jonathan M.
中科院分区：
文献类型：
--
作者：
Hatt, Sarah R.;Mohney, Brian G.;Holmes, Jonathan M.
目的：距离立体视敏度用于监测间歇性外斜视（IXT）恶化，但立体视敏度的变异性尚未得到严格的研究。本研究的目的是评估IXT患儿一天内立体视敏度的变异性。设计：前瞻性队列研究。方法：招募12例IXT患儿。立体视锐度在远处采用弗里斯比戴维斯距离测验和距离随机测验，在近处采用弗里斯比和学龄前随机测验。测试在一天内重复了三到四次，每次评估之间至少间隔两个小时。主要的结果测量是可变立体视敏度，定义为一天中任意两个时间点之间的两个或两个以上对数水平的变化。结果：12例患者中有5例（42%）出现远距离立体视敏变化。12例患者中有4例（33%）使用距离随机测试显示出不同的结果，其中3例使用Frisby Davis距离测试也显示出不同的结果。一名患者仅使用弗里斯比·戴维斯距离测试结果不同。12例患者中有9例（75%）完成近立体视力测试；9名患者中有2名（22%）表现出不同的近立体锐度。9名儿童中有2名（22%）使用学前随机测试显示出不同的结果，其中1名（11%）使用弗里斯比测试也显示出不同的结果。在某些情况下，立体敏锐度在一次评估中从可测量的立体敏锐度变为在另一次评估中为零。结论：近一半的IXT患儿在一天内显示出立体视敏度的显著变化。当基于孤立的测量时，两次访问之间距离立体视敏度的明显变化应谨慎解释。
PURPOSE: Distance stereoacuity is used to monitor deterioration of intermittent exotropia (IXT), but variability of stereoacuity has not been studied rigorously. The purpose of this study was to assess the variability of stereoacuity over one day in children with IXT. DESIGN: Prospective cohort study.METHODS: Twelve children with IXT were recruited. Stereoacuity was assessed using the Frisby Davis Distance test and the Distance Randot test at distance, and the Frisby and Preschool Randot tests at near. Tests were repeated three or four times over the day, with at least two hours between assessments. The main outcome measure was variable stereoacuity defined as a change by two or more log levels between any two time points over the day.RESULTS: Variable stereoacuity at distance was found in five (42%) of 12 patients. Four (33%) of 12 patients demonstrated variable results using the Distance Randot test, three of whom also showed variable results using the Frisby Davis Distance test. One patient had variable results using the Frisby Davis Distance test only. Nine (75%) of 12 patients completed near stereoacuity testing; two (22%) of nine showed variable near stereoacuity. Two (22%) of nine showed variable results using the Preschool Randot test, one (11%) of whom also had variable results using the Frisby test. In some cases, stereoacuity changed from measurable stereoacuity on one assessment to nil on another.CONCLUSIONS: Nearly half of children with IXT show marked changes in stereoacuity over the course of a single day. When based on isolated measures, an apparent change in distance stereoacuity between visits should be interpreted with caution.