Improving the Reliability of the Pelli-Robson Contrast Sensitivity Test
Improving the Reliability of the Pelli-Robson Contrast Sensitivity Test
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DOI：
10.1364/navs.1991.md12
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
D. Elliott;M. Bullimore;I. Bailey
中科院分区：
文献类型：
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作者：
D. Elliott;M. Bullimore;I. Bailey
对比敏感度测试的临床应用已经在许多报告中讨论，并且许多打印的对比敏感度测试是市售的。这些测试中的一些使用字母作为目标而不是正弦波或方波光栅（Regan和Neima，1983; Pelli等人，1988年）。字母对比敏感度图表具有快速管理的优点，并且患者和从业者都熟悉任务的性质。字母识别任务的优势在于它是一种多选择的强制选择程序，限制了患者标准效应（Vaegen和Halliday，1983）。Pelli-Robson图表（Pelli等人，1988年）由十六个字母组成，每个字母在推荐的1米观察距离下对向3度。在每个三联体中，字母具有相同的对比度，并且每个连续三联体中的对比度以0.15个对数单位（102）的因子减小。Pelli等人建议将对比敏感度评分为最低对比度水平，在该最低对比度水平下，至少有两个三联体被正确识别。
The clinical applications of contrast sensitivity testing have been discussed in numerous reports, and a number of printed contrast sensitivity tests are commercially available. Some of these tests use letters as targets rather than sine or square wave gratings (Regan and Neima, 1983; Pelli et al., 1988). Letter contrast sensitivity charts have the advantage of being quick to administer and the nature of the task is familiar to both the patient and the practitioner. The letter identification task has the advantage of being a multiple-alternative forced-choice procedure that limits patient criterion effects (Vaegen and Halliday, 1983). The Pelli-Robson chart (Pelli et al., 1988) consists of sixteen triplets of letters, with each letter subtending 3 degrees at the recommended viewing distance of 1 meter. Within each triplet the letters have the same contrast and the contrast in each successive triplet decreases by a factor of 0.15 log units (√2). Pelli et al. recommend scoring contrast sensitivity as the lowest contrast level at which at least two of the triplet are identified correctly.