Defining Real Change in Measures of Stereoacuity
Defining Real Change in Measures of Stereoacuity
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DOI：
10.1016/j.ophtha.2008.09.012
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发表时间：
2009-02-01
期刊：
影响因子：
13.7
通讯作者：
Holmes, Jonathan M.
中科院分区：
文献类型：
--
作者：
Adams, Wendy E.;Leske, David A.;Holmes, Jonathan M.
目的：为了建立“真实的变化”的立体视敏度的阈值，通过定义长期的测试-重测的变异性为95%的限制协议为4 stereocuity tests.Design：回顾性队列study.Participants和Control：我们确定了36例（中位数，17年;范围，7-76）与任何类型的稳定斜视谁有立体视敏度测量2个连续的访问。稳定性斜视定义为同时棱镜遮盖试验和棱镜交替遮盖试验测得的偏斜角在5个棱镜屈光度以内。方法：用幼儿园Randot和近Frisby立体视试验测得近侧立体视锐度，用Frisby-Davis距离（FD 2）和远距离Randot立体视锐度。将立体视敏度转换为对数单位进行分析。95%的一致性限度是根据测试和再测试之间差异的标准差的1.96倍计算的。主要结果测量：连续2次访视时立体视阈值变化的95%一致性限度。95%的一致性界限为0.59 log arcsec的学前Randot，0.24为近Frisby，0.68为FD 2，0.46为距离Randot。这些值对应于下面的倍频程步长（阈值的两倍;例如，结论：对于大多数立体视检查，需要改变约2个倍频程的立体视阈值才能超过重测变异。变化
Purpose: To establish the thresholds for "real change" in stereoacuity by defining long-term test-retest variability as 95% limits of agreement for 4 stereoacuity tests.Design: Retrospective cohort study.Participants and Controls: We identified 36 patients (median, 17 years; range, 7-76) with any type of stable strabismus who had stereoacuity measured on 2 consecutive visits. Stable strabismus was defined as angle of deviation within 5 prism diopters by simultaneous prism and cover test and prism and alternating cover test.Methods: Stereoacuity was measured at near using the preschool Randot and the near Frisby stereotests and at distance using the Frisby-Davis distance (FD2) and the distance Randot stereotests. Stereoacuity was transformed to log units for analysis. The 95% limits of agreement were calculated based on a 1.96 multiple of the standard deviation of differences between test and retest.Main Outcome Measures: The 95% limits of agreement for change in stereoacuity thresholds at 2 consecutive visits.Results: The 95% limits of agreement Were 0.59 log arcsec for the preschool Randot, 0.24 for the near Frisby, 0.68 for the FD2, and 0.46 for the distance Randot. These values correspond with the following octave steps (doublings of threshold; e.g., 200-400 arcsec): preschool Randot, 1.95; near Frisby, 0.78; FD2, 2.27; and distance Randot, 1.52.Conclusions: A change of approximately 2 octaves of stereoacuity threshold are needed to exceed test-retest variability for most stereoacuity tests,. Changes