Reliability of reading speed measurement in patients with subfoveal choroidal lesions

L. D. McCaffrey, M. J. Marsh, J. L. Blank, J. M. Brown, K. L. Gumming, B. S. Hawkins

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose. To assess measurement reliability of reading speed from charts with meaningful text. Methods. During a 1 year period, personnel at 3 centers participating in the Submacular Surgery Trials (SST) Pilot Study took part in an evaluation of reliability of a reading speed test. High-contrast cards were used; each contained paragraphs of approximately 40 words of meaningful text. Letter size corresponded to a visual acuity (VA) of approximately 20/1500, at a 10 inch test distance. Ambient illumination was 50 to 100 foot-candles. Additional lighting illuminated the card. Patients had subfoveal choroidal lesions in at least 1 eye. Time to read all words on a card and number of words read incorrectly were recorded. Results. 79 patients (158 eyes) participated. Best corrected VA ranged from 20/20 to less than 20/1600. All words of the text could not be read in 3 minutes or less by 26 eyes. Reliability was excellent in the other 132 eyes (intraclass correlation coefficient [ICC] = .95; 95% confidence interval = .93-.96). More variability existed between initial and retest reading speeds for eyes with better visual acuity; the largest differences between measurements were observed in eyes with better VA. ICCs were .90 or greater in all subgroups examined including untreated eyes, post-surgery eyes, and postlaser eyes. Conclusions. Reading speed measurements with these high contrast charts are reproducible by the same examiner, even in eyes with subfoveal lesions and poor VA. Inter-examiner reliability currently is under evaluation.

Original languageEnglish (US)
Pages (from-to)S676
JournalInvestigative Ophthalmology and Visual Science
Volume38
Issue number4
StatePublished - Dec 1 1997

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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