An evaluation of the Mars Letter Contrast Sensitivity Test.

摘要: Purpose. The Mars Letter Contrast Sensitivity Test (initially known as the Lighthouse Test) is similar in design to Pelli-Robson but may offer several advantages. This study evaluates repeatability of test and its agreement with normal low-vision subjects. Methods. Fifty-four subjects were tested (age 22-86 years), including 20 normally sighted young adults, 17 older adults low vision (20/16 20/250). Subjects both contrast sensitivity tests ETDRS visual acuity chart. After a short break, retested an alternate form each test. chart forms used (two three Mars) order testing varied systematically. Testing was monocular habitual correction and, for over 40 years age, included appropriate near add. Letter-by-letter scoring tests. Repeatability assessed by determining 95% limits (LoA): 1.96 standard deviations differences between administrations or Results. showed excellent test, LoA 0.21 log units all similarly repeatable (95% 0.20 units) among Conclusion. new shows has repeatability. There are subtle actual levels on different adjusting these leads superior Thus, be useful alternative offering advantages, smaller size, improved durability, ease use. (Optom Vis Sci 2005;82:970-975)