The Effect of Test Distance on Visual Contrast Sensitivity Measured Using the Pelli-Robson Chart.
The Effect of Test Distance on Visual Contrast Sensitivity Measured Using the Pelli-Robson Chart.
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测试距离对使用Pelli-Robson图测量的视觉对比敏感度的影响。
DOI：
10.1167/tvst.10.2.32
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发表时间：
2021-02-05
影响因子：
3
通讯作者：
Brown AM
中科院分区：
文献类型：
--
作者：
Njeru SM;Osman M;Brown AM
Pelli-Robson（PR）图广泛用于测量临床对比敏感度（CS）。一般认为，PR测试距离并不重要。在这里，我们检查是否比通常的1米更近的测试距离可能对低视力患者更好。对低视力学生（<20岁）和老年人（>65岁）进行PR-CS测量。在1米处和更近距离处测量学生PR，d =视力，单位为log 10 cy/deg（d = 1.5-logMAR）。在1米和3米处测量老年人PR。还使用俄亥俄州对比卡（OCC）测量了光栅CS。平均CS为0.398 log 10单位（PR图上的一条线），在较近的距离比在1米的学生，但没有影响1与3米的测试距离的老年人。PR字母在1米处的等效空间频率接近低视力学生的视力极限，而接近老年人CS功能的峰值。特别是对于低视力的学生，PR CS低于OCC CS，即使PR在更近的距离进行测试。PR CS应在等于患者字母敏锐度（cy/deg）或1.5-logMAR的距离（以米为单位）处测量。对比敏感度与生活质量密切相关，准确测量它非常重要。使用更近的距离，或测量光栅CS，可以揭示当使用1米处的PR测试低视力患者时错过的视觉能力。
The Pelli-Robson (PR) chart is widely used to measure clinical contrast sensitivity (CS). It is generally believed that PR testing distance is not critical. Here, we examine whether a closer test distance than the usual 1 meter might be better for patients with low vision. PR CS was measured on two groups: low-vision students (<20 years old) and elder patients (>65 years old). Student PR was measured at 1 meter and at a closer distance d = visual acuity in log10cy/deg (d = 1.5–logMAR). Elder PR was measured at 1 and 3 meters. Grating CS was also measured using the Ohio Contrast Cards (OCCs). Average CS was 0.398 log10 units (over one line on the PR chart) higher at the closer distance than at 1 meter for the students, but there was no effect of 1 vs. 3 meters test distance for the elders. The equivalent spatial frequencies of the PR letters at 1 meter were near the acuity limits of students with low vision, but were near the peak of the elders’ CS functions. Especially for students with low vision, PR CS was below OCC CS, even when PR was tested at a closer distance. PR CS should be measured at a distance in meters that is equal to the patient's letter acuity in cy/deg, or 1.5–logMAR. Contrast sensitivity is highly associated with quality of life, and it is important to measure it accurately. Using a closer distance, or measuring grating CS, can reveal visual abilities missed when patients with low vision are tested using PR at 1 meter.
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影响因子：
1.8
作者：
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作者：
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通讯作者：
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