Rowe Fiona J, Hepworth Lauren R, Howard Claire, Chean Chung Shen, Mistry Meera
Department of Health Services Research, University of Liverpool , Liverpool.
Strabismus. 2019 Sep;27(3):182-190. doi: 10.1080/09273972.2019.1643893. Epub 2019 Jul 22.
: New methods of measurement require testing to evaluate test validity. This study compares stereoacuity results of the Lang Stereopad to other common clinical stereoacuity assessments in a normal vision population. : A prospective cross-sectional study was conducted comparing the Lang Stereopad stereoacuity results to results from the Lang II, Frisby, and TNO stereo tests. Mean stereoacuity values and their correlation with inter-ocular visual acuity difference were compared for each stereo test. : 98 subjects (mean age of 33.5 years, SD 14.1; 39 males and 59 females) with normal parameters of visual function underwent multiple stereotest assessments. Median stereoacuity values were the lowest (i.e. more detailed stereoacuity) when using the Frisby stereotest (median 40"; 20-170" [minimum-maximum]) and TNO stereotest (median 60"; 15-480"). In comparison, medians were about double at 100" (50-800") for the Lang Stereopad and greater at 200" (200-200") for the Lang II stereotest. There was no correlation for each stereotest with interocular visual acuity differences. : The Lang Stereopad test is easy to administer and it has certain advantages such as no requirement for additional test glasses. It is a useful assessment to add to the clinical armamentarium for binocular assessment of stereopsis. The Lang Stereopad does not agree well with other stereo tests such as the TNO and Frisby but provides a greater stereoacuity test range than the Lang II. The Lang Stereopad now requires testing in a clinical population in which stereoacuity is a pre-requisite part of the assessment.
新的测量方法需要进行测试以评估测试效度。本研究比较了在正常视力人群中，Lang立体视标与其他常见临床立体视锐度评估方法的结果。
进行了一项前瞻性横断面研究，比较了Lang立体视标的立体视锐度结果与Lang II、Frisby和TNO立体视测试的结果。比较了每种立体视测试的平均立体视锐度值及其与双眼视力差异的相关性。
98名视觉功能参数正常的受试者（平均年龄33.5岁，标准差14.1；39名男性和59名女性）接受了多次立体视测试评估。使用Frisby立体视测试（中位数40"；20 - 170"[最小值 - 最大值]）和TNO立体视测试（中位数60"；15 - 480"）时，立体视锐度的中位数最低（即立体视锐度更精细）。相比之下，Lang立体视标的中位数在100"（50 - 800"）左右，是前两者的两倍左右，而Lang II立体视测试在200"（200 - 200"）时的中位数更高。每种立体视测试与双眼视力差异均无相关性。
Lang立体视标测试易于实施，具有一些优点，例如无需额外的测试眼镜。它是临床双眼立体视评估工具库中的一项有用评估方法。Lang立体视标与TNO和Frisby等其他立体视测试结果不太一致，但比Lang II提供了更大的立体视锐度测试范围。现在需要在立体视锐度是评估必要组成部分的临床人群中对Lang立体视标进行测试。
