The letter contrast sensitivity test : clinical evaluation of a new design Haymes, Sharon A., Roberts, Kenneth F., Cruess, Alan F., Nicolela, Marcelo T., LeBlanc, Raymond P., Ramsey, Michael S., Chauhan, Balwantray C. and Artes, Paul H. 2006, The letter contrast sensitivity test : clinical evaluation of a new design, Investigative ophthalmology and visual science, vol. 47, no. 6, pp. 2739-2745, doi: 10.1167/iovs.05-1419. Attached Files Name Description MIMEType Size Downloads Title The letter contrast sensitivity test : clinical evaluation of a new design Author(s) Haymes, Sharon A. Roberts, Kenneth F. Cruess, Alan F. Nicolela, Marcelo T. LeBlanc, Raymond P. Ramsey, Michael S. Chauhan, Balwantray C. Artes, Paul H. Journal name Investigative ophthalmology and visual science Volume number 47 Issue number 6 Start page 2739 End page 2745 Total pages 7 Publisher Association for Research in Vision and Ophthalmology Place of publication Rockville, Md. Publication date 2006-06 ISSN 0146-0404 1552-5783 Summary PURPOSE. To compare the reliability, validity, and responsiveness of the Mars Letter Contrast Sensitivity (CS) Test to the Pelli-Robson CS Chart. METHODS. One eye of 47 normal control subjects, 27 patients with open-angle glaucoma, and 17 with age-related macular degeneration (AMD) was tested twice with the Mars test and twice with the Pelli-Robson test, in random order on separate days. In addition, 17 patients undergoing cataract surgery were tested, once before and once after surgery. RESULTS. The mean Mars CS was 1.62 log CS (0.06 SD) for normal subjects aged 22 to 77 years, with significantly lower values in patients with glaucoma or AMD (P < 0.001). Mars test-retest 95% limits of agreement (LOA) were ±0.13, ±0.19, and ±0.24 log CS for normal, glaucoma, and AMD, respectively. In comparison, Pelli-Robson test-retest 95% LOA were ±0.18, ±0.19, and ±0.33 log CS. The Spearman correlation between the Mars and Pelli-Robson tests was 0.83 (P < 0.001). However, systematic differences were observed, particularly at the upper-normal end of the range, where Mars CS was lower than Pelli-Robson CS. After cataract surgery, Mars and Pelli-Robson effect size statistics were 0.92 and 0.88, respectively. CONCLUSIONS. The results indicate the Mars test has test-retest reliability equal to or better than the Pelli-Robson test and comparable responsiveness. The strong correlation between the tests provides evidence the Mars test is valid. However, systematic differences indicate normative values are likely to be different for each test. The Mars Letter CS Test is a useful and practical alternative to the Pelli-Robson CS Chart. Language eng DOI 10.1167/iovs.05-1419 Field of Research 119999 Medical and Health Sciences not elsewhere classified Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences HERDC Research category C1.1 Refereed article in a scholarly journal Copyright notice ©2006, Association for Research in Vision and Ophthalmology Persistent URL http://hdl.handle.net/10536/DRO/DU:30047493 Document type: Journal Article Collection: School of Medicine Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Thu, 30 Aug 2012, 09:36:09 EST Thu, 30 Aug 2012, 10:35:15 EST Fri, 14 Sep 2012, 14:36:02 EST Fri, 14 Sep 2012, 14:37:11 EST Fri, 13 Jun 2014, 15:06:28 EST Filtered Full Citation counts:   Cited 33 times in TR Web of Science Cited 0 times in Scopus Search Google Scholar Access Statistics: 103 Abstract Views, 1 File Downloads  -  Detailed Statistics Created: Thu, 30 Aug 2012, 09:36:09 EST

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