An evaluation of the Mars Letter Contrast Sensitivity Test
An evaluation of the Mars Letter Contrast Sensitivity Test
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DOI：
10.1097/01.opx.0000187844.27025.ea
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发表时间：
2005-11-01
影响因子：
1.4
通讯作者：
Bullimore, MA
中科院分区：
文献类型：
--
作者：
Dougherty, BE;Flom, RE;Bullimore, MA
目的.火星字母对比敏感度测试（最初称为灯塔字母对比敏感度测试）在设计上类似于佩利-罗布森测试，但可能提供几个优点。本研究评估了正常和低视力受试者中Mars测试的可重复性及其与Pelli-Robson测试的一致性。方法.对54名受试者（年龄22-86岁）进行了测试，包括20名视力正常的年轻人，17名视力正常的老年人和17名视力低下的成年人（20/16至20/250）。受试者接受对比敏感度测试和ETDRS视力表测试。在短暂的休息后，受试者重新测试每一种对比敏感度测试的替代形式。使用的图表形式（两个Pelli-Robson和三个Mars）和测试顺序系统地变化。测试是单眼习惯性矫正，对于40岁以上的受试者，包括适当的近距离增加。两项测试都采用逐个字母评分。通过确定95%一致性限度（LoA）评估重复性和一致性：给药或检测之间差异的+/- 1.96标准差。结果Mars测试显示与Pelli-Robson测试非常一致，所有受试者的95% LoA均为0.21 log单位。在所有受试者中，Mars检验的可重复性（95% LoA = +/- 0.20 log单位）与Pelli-Robson检验（95% LoA = +/- 0.20 log单位）相似。结论新的Mars Letter对比敏感度测试显示与Pelli-Robson测试非常一致，并且具有类似的可重复性。在不同形式的火星测试中，实际对比度水平存在细微差异，针对这些差异进行调整可使火星测试具有上级可重复性。因此，火星测试可能是一个有用的替代佩利-罗布森测试提供了几个优点，包括更小的尺寸，更好的耐用性，和易于使用。
Purpose. The Mars Letter Contrast Sensitivity Test (initially known as the Lighthouse Letter Contrast Sensitivity Test) is similar in design to the Pelli-Robson Test but may offer several advantages. This study evaluates the repeatability of the Mars test and its agreement with the Pelli-Robson test in normal and low-vision subjects. Methods. Fifty-four subjects were tested (age 22-86 years), including 20 normally sighted young adults, 17 normally sighted older adults, and 17 adults with low vision (20/16 to 20/250). Subjects were tested with both contrast sensitivity tests and with the ETDRS visual acuity chart. After a short break, subjects were retested with an alternate form of each contrast sensitivity test. The chart forms used (two Pelli-Robson and three Mars) and the order of testing were varied systematically. Testing was monocular with habitual correction and, for subjects over 40 years of age, included appropriate near add. Letter-by-letter scoring was used for both tests. Repeatability and agreement were assessed by determining the 95% limits of agreement (LoA): +/- 1.96 standard deviations of the differences between administrations or tests. Results. The Mars test showed excellent agreement with the Pelli-Robson test, with 95% LoA of 0.21 log units for all subjects. The Mars test was similarly repeatable (95% LoA = +/- 0.20 log units) to the Pelli-Robson test (95% LoA = +/- 0.20 log units) among all subjects. Conclusion. The new Mars Letter Contrast Sensitivity Test shows excellent agreement with the Pelli-Robson test and has similar repeatability. There are subtle differences in the actual contrast levels on different forms of the Mars test, and adjusting for these differences leads to superior repeatability of the Mars test. Thus, the Mars test may be a useful alternative to the Pelli-Robson test offering several advantages, including smaller size, improved durability, and ease of use.