PURPOSE: The aim of this study was to develop and validate the first standardized Arabic continuous text near-visual-acuity chart, the Balsam Alabdulkader-Leat (BAL) chart.
METHODS: Three versions of the BAL chart were created from previously validated sentences. Reading acuity (RA) and reading speed in standard-length words per minute (SLWPM) were measured for three versions of the BAL chart and three English charts (MNREAD, Colenbrander, and Radner) for 86 bilingual adults with normal vision aged 15 to 59 years. The RA and SLWPM were compared using analysis of variance. To analyze agreement between the charts, Bland-Altman plots were used. Normal visual acuity (0.00 logMAR [log minimum angle of resolution]) was calibrated for the BAL chart with linear regression analysis.
RESULTS: Average RAs for BAL1, BAL2, and BAL3 were 0.62, 0.64 and 0.65 log-point print, respectively, which were statistically significantly different (repeated-measures analysis of variance, P < .05), but not considered clinically significant. The coefficients of agreement for RA between the BAL charts were 0.054 (between 1 and 2), 0.061 (between 2 and 3), and 0.059 (between 1 and 3). Linear regression between the average RA for the BAL chart and the MNREAD and Radner charts showed that 0.7 log-point size at 40 cm is equivalent to 0.00 logMAR, and the new BAL chart was labeled accordingly. Mean SLWPM for the BAL charts was 201, 195, and 195 SLWPM, respectively, and for the Colenbrander, MNREAD, and Radner charts was 146, 171, and 146, respectively. The coefficients of agreement for log-SLWPM between BAL1 and BAL2, BAL2 and BAL3, and BAL1 and BAL3 were 0.063, 0.064, and 0.057 log-SLWPM, respectively.
CONCLUSIONS: The BAL chart showed high interchart agreement. It is recommended for accurate near performance measures in Arabic for both research and clinical settings.
School of Optometry and Vision Science, University of Waterloo, Waterloo, Ontario, Canada
Corresponding Author: Balsam Alabdulkader University of Waterloo 200 University Ave W Waterloo, Ontario Canada N2L 3G1 e-mail: email@example.com
Submitted: September 22, 2016
Accepted: May 3, 2017
Funding/Support: This study was funded by King Saud University, Saudi Arabia.
Conflict of Interest Disclosure: The authors have an interest in the potential commercialization of these charts.
Author Contributions and Acknowledgments: Formal analysis: BA; Investigation: BA; Methodology: BA, SL; Writing – original draft: BA; Writing – review & editing: BA, SL; Project administration: SL; Supervision: SL.
The authors thank Dr. Khalid Jamous for his help in recruiting participants in Riyadh, Saudi Arabia. They also thank Dr. Gordon Legge for his valuable comments.