Maximum angle of horizontal strabismus consistent with true stereopsis
Maximum angle of horizontal strabismus consistent with true stereopsis
复制标题
DOI：
10.1016/j.jaapos.2003.08.010
复制
发表时间：
2004-02-01
期刊：
影响因子：
1.6
通讯作者：
Holmes, JM
中科院分区：
文献类型：
--
作者：
Leske, DA;Holmes, JM
背景。我们前瞻性地评估了三种立体视力测试在斜视角度范围广的患者中的表现，以确定与真实立体视一致的水平斜视的最大角度以及假阳性结果的程度。方法：对年龄大于或等于5岁的持续水平斜视患者（186例）进行前瞻性研究。立体视敏度采用提莫斯蝇、动物和圆圈测试测量；独创的学前随机测验；还有弗里斯比测试。我们将假阳性结果定义为当患者有bbb20棱镜屈光度（PD）偏差时，对立体视力测试的任何阳性反应。根据我们之前对打单眼补丁的成年人的研究结果，我们将真正的阳性结果定义为：在最初的学前随机测试中，Titmus圈为5到9，至少为400”，或者在弗里斯比测试中通过。然后对数据进行分析，以确定与真实立体视觉一致的最大偏差。结果。假阳性结果出现在蝇粪（6%）、动物粪（10%）、圆圈粪（35%）和原学前随机测试800秒弧度（“）水平（10%）。弗里斯比试验未见假阳性结果。应用真阳性结果的标准，我们发现bbb10pd偏差的患者没有真正的立体视觉。两名PD偏差分别为10和6的患者随后无法通过Frisby试验，因此认为不具有真正的立体视觉。我们得出结论，真正立体视觉的阈值可能低至4 PD的水平偏差。结论：综上所述，蝇蚋、鼠蚋和蚊蚋圈（前四个圆圈）试验具有单眼线索，限制了它们在临床试验中的实用性。弗里斯比测试对于快速评估立体视是否存在特别有用。新的学前随机测试是有价值的量化立体视觉在儿童和成人。当患者有水平偏移bbb4pd时，真正的立体视可能是罕见的。
Background. We prospectively evaluated the performance of three stereoacuity tests in patients with a wide range of strabismus angles to determine the maximum angle of horizontal strabismus consistent with true stereopsis as well as the extent of false-positive results. Methods: Subjects age greater than or equal to 5 years old (n = 186) with constant horizontal strabismus were prospectively studied. Stereoacuity was measured using the Titmus Fly, Animals, and Circles tests; the original Preschool Randot test; and the Frisby test. We defined a false-positive result as any positive response to a stereoacuity test when a patient had > 20 prism diopters (PD) of deviation. Based on the results from our previous study of monocularly patched adults, we then defined a true-positive result as Titmus circles five to nine, at least 400" on the original Preschool Randot test, or a pass on the Frisby test. Data were then analyzed to determine a maximum deviation consistent with true stereopsis. Results. False-positive results occurred with Titmus Fly (6%), Titmus Animals (10%), Titmus Circles (35%), and the 800 seconds of arc (") level of the original Preschool Randot test (10%). No false-positive results were seen with the Frisby test. Applying the criteria for a true-positive result, we found that no patient with > 10 PD of deviation had true stereopsis. The two patients with 10 PD and 6 PD deviations could not subsequently pass the Frisby test and were therefore deemed not to have true stereopsis. We concluded that the threshold for true stereopsis may be as low as 4 PD of horizontal deviation. Conclusion: In summary, the Titmus Fly, Titmus Animals, and Titmus Circles (the first four circles) tests possess monocular clues that limit their usefulness for clinical testing. The Frisby test is particularly useful for rapid assessment of whether stereopsis is present or absent. The new Preschool Randot test is valuable for quantifying stereopsis in both children and adults. True stereopsis may be rare when a patient has a horizontal deviation > 4 PD.