Evaluation of contrast sensitivity in patients with advanced glaucoma: comparison of two tests

Alessandro A. Jammal, Bruna G. Ferreira, Camila S. Zangalli, Jayme R. Vianna, Atalie C. Thompson, Paul H. Artes, Vital P. Costa, Alexandre S.C. Reis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

<jats:sec><jats:title>Aims</jats:title><jats:p>To evaluate contrast sensitivity (CS) in patients with advanced glaucomatous visual field damage, and to compare two clinical CS tests.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>This was a cross-sectional test–retest study. Twenty-eight patients with open-angle glaucoma, visual acuity (VA) better than 20/40 and visual field mean deviation (MD) worse than −15 dB were enrolled. Patients underwent VA, visual field and CS testing with the Pelli-Robson (PR) chart and the Freiburg Visual Acuity and Contrast Test (FrACT). Retest measurements were obtained within 1 week to 1 month.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>Median (IQR) age and MD were 61.5 (55.5 to 69.2) years and −27.7 (−29.7 to −22.7) dB, respectively. Median (IQR) VA was 0.08 logarithm minimum angle of resolution (0.02 to 0.16), corresponding to 20/25 (20/20 to 20/30). Median (IQR) CS was 1.35 (1.11 to 1.51) log units with the PR chart and 1.39 (1.24 to 1.64) log units with FrACT. VA explained less than 40% of the variance in CS (adjusted R<jats:sup>2</jats:sup>=0.36). CS estimates of both tests were closely related (rho=0.88, p=0.001), but CS was 0.09 log units higher with FrACT compared with the PR chart, and the 95% repeatability intervals (Bland-Altman) were 46% tighter with the PR chart.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>Despite near-normal VA, almost all patients showed moderate to profound deficits in CS. CS measurement provides additional information on central visual function in patients with advanced glaucoma.</jats:p></jats:sec>
Original languageEnglish
Pages (from-to)1418-1422
Number of pages0
JournalBritish Journal of Ophthalmology
Volume104
Issue number10
Early online date23 Jan 2020
DOIs
Publication statusPublished - Oct 2020

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