Reliability of high- and low-contrast letter charts

Reeves, Barnaby C., Wood, Joanne M., & Hill, Adrian R. (1993) Reliability of high- and low-contrast letter charts. Ophthalmic and Physiological Optics, 13(1), pp. 17-26.

View at publisher


The aim of this study was to measure the reliability, in test score units, of several clinical tests which use high- and low-contrast letters, and to provide an estimate of what constitutes a significant change in performance over time. Patients with normal vision and with early or subtle eye disease were recruited so that the results would be representative of the population likely to present for primary vision screening. Patients were tested on the Bailey-Lovie logMAR chart, the Regan low-contrast letter charts and the Pelli-Robson low-contrast letter chart on two occasions; the two test sessions were separated by at least four weeks to give an estimate of reliability appropriate for the conditions under which the tests are likely to be used. A 'significant change', i.e. one which would be observed in only about 5% of patients with stable visual performance, was about +/- 2 'steps' of the measurement scale, i.e. +/- 2 lines for the Bailey-Lovie and Regan charts and +/- 2 letter groups for the Pelli-Robson chart.

Impact and interest:

53 citations in Scopus
52 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 11910
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author.
DOI: 10.1111/j.1475-1313.1993.tb00421.x
ISSN: 0275-5408
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Divisions: Past > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1993 Blackwell Publishing
Copyright Statement: The definitive version is available at
Deposited On: 14 Jan 2008 00:00
Last Modified: 21 Apr 2010 16:43

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page