The Ohio Contrast Cards: Visual Performance in a Pediatric Low-vision Site
The Ohio Contrast Cards: Visual Performance in a Pediatric Low-vision Site
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DOI：
10.1097/opx.0000000000001119
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发表时间：
2017-10-01
影响因子：
1.4
通讯作者：
Brown, Angela M.
中科院分区：
文献类型：
--
作者：
Hopkins, Gregory R., II;Dougherty, Bradley E.;Brown, Angela M.
意义：本报告描述了俄亥俄对比卡的首次临床应用，这是一种新的测试，用于测量无法识别和识别光型的低视力患者的最大空间对比灵敏度，并且对于他们来说，最大对比灵敏度的空间频率是未知的。目的：比较俄亥俄州对比卡的测量值与其他三种视力测试的测量值以及对俄亥俄州州立盲人学校部分视力学生的视力相关生活质量问卷的测量值。方法：俄亥俄对比卡显示印刷方波光栅在非常低的空间频率（0.15周期/度）。病人看包含光栅的卡片的左/右。25名学生（13至20岁）提供了四种视觉表现测量方法：两种光栅卡测试（俄亥俄对比卡和泰勒视力卡）和两种字母表（佩利-罗布森对比表和贝利-洛维视力表）。利用光栅数据的约束对空间对比敏感度函数进行建模。视力障碍对儿童的影响调查问卷测量了与视力相关的生活质量。结果：俄亥俄对比卡的对比灵敏度始终低于模型预测的最大可能对比灵敏度0.19 log10单位；平均Pelli-Robson字母对比灵敏度接近模型预测，但比最大值低0.516 log10个单位。字母锐度比光栅锐度结果低0.336 logMAR。对于低视力患者，该模型从Bailey-Lovie视敏度计算出最佳Pelli-Robson对比灵敏度的最佳测试距离（以米为单位）为距离= 1.5 -logMAR。在四项视力测试中，只有俄亥俄对比卡对比敏感度与学生的生活质量具有独立的统计学显著相关。结论：俄亥俄对比卡结合了光栅刺激、观察指示行为和对比灵敏度测量。它们显示了对临床目标的承诺，即向患者及其护理人员建议患者在日常生活中可能享受的成功。版权所有(C) 2017作者由威科集团代表美国视光学会出版。
SIGNIFICANCE: This report describes the first clinical use of the Ohio Contrast Cards, a new test thatmeasures the maximum spatial contrast sensitivity of low-vision patients who cannot recognize and identify optotypes and for whom the spatial frequency of maximum contrast sensitivity is unknown.PURPOSE: To compare measurements of the Ohio Contrast Cards to measurements of three other vision tests and a vision-related quality-of-life questionnaire obtained on partially sighted students at Ohio State School for the Blind.METHODS: The Ohio Contrast Cards show printed square-wave gratings at very low spatial frequency (0.15 cycle/degree). The patient looks to the left/right side of the card containing the grating. Twenty-five students (13 to 20 years old) provided four measures of visual performance: two grating card tests (the Ohio Contrast Cards and the Teller Acuity Cards) and two letter charts (the Pelli-Robson contrast chart and the Bailey-Lovie acuity chart). Spatial contrast sensitivity functions were modeled using constraints from the grating data. The Impact of Vision Impairment on Children questionnaire measured vision-related quality of life.RESULTS: Ohio Contrast Card contrast sensitivity was always less than 0.19 log10 units below the maximum possible contrast sensitivity predicted by the model; average Pelli-Robson letter contrast sensitivity was near themodel prediction, but 0.516 log10 units below the maximum. Letter acuity was 0.336 logMAR below the grating acuity results. The model estimated the best testing distance in meters for optimum Pelli-Robson contrast sensitivity from the Bailey-Lovie acuity as distance = 1.5 -logMAR for low-vision patients. Of the four vision tests, only Ohio Contrast Card contrast sensitivity was independently and statistically significantly correlated with students' quality of life.CONCLUSIONS: The Ohio Contrast Cards combine a grating stimulus, a looking indicator behavior, and contrast sensitivity measurement. They show promise for the clinical objective of advising the patient and his/her caregivers about the success the patient is likely to enjoy in tasks of everyday life. Copyright (C) 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Optometry.