Visual outcomes in treated bacterial keratitis: Four years of prospective follow-up

Scott M. McClintic, Namperumalsamy V. Prajna, Muthiah Srinivasan, Jeena Mascarenhas, Prajna Lalitha, Revathi Rajaraman, Catherine E. Oldenburg, Kieran S. O'Brien, Kathryn J. Ray, Nisha R. Acharya, Thomas M. Lietman, Jeremy D. Keenan

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Purpose. We described the change in visual acuity experienced by eyes successfully treated for bacterial keratitis. Methods. This was a prospective cohort study of a subset of study participants who had previously enrolled in the Steroids for Corneal Ulcers Trial (SCUT). All study participants had been diagnosed with culture-proven bacterial keratitis before enrollment in SCUT and subsequently were randomized to adjunctive topical corticosteroids or placebo. During SCUT, we monitored study participants at enrollment, 3 weeks, 3 months, and 12 months. We invited a subset to complete a comprehensive eye examination approximately 4 years after enrollment in SCUT. Certified refractionists assessed best spectacle-corrected visual acuity (BSCVA) using the same protocol at each study visit. Results. We examined 50 SCUT participants at 4 years after enrollment. Among those in this cohort, mean logMAR BSCVA at enrollment was 0.85 (Snellen equivalent, 20/160; 95% confidence interval [CI], 0.71-0.99). On average, visual acuity improved by 2.9 logMAR lines from enrollment to 3 weeks (P < 0.001), 1.2 lines from 3 weeks to 3 months (P = 0.002), and 0.8 lines from 3 to 12 months (P = 0.01). The BSCVA did not change significantly between 12 months and 4 years (0.04-line improvement, P = 0.88). After controlling for visual acuity at enrollment, BSCVA was not significantly different between the corticosteroid and placebo groups at 4 years (P = 0.53). Conclusions. Cases of bacterial keratitis may continue to demonstrate improvements in visual acuity up to 12 months following diagnosis, but further improvements are unlikely. These findings may guide the appropriate timing of surgical intervention in these patients. ( number, NCT00324168.)

Original languageEnglish (US)
Pages (from-to)2935-2940
Number of pages6
JournalInvestigative Ophthalmology and Visual Science
Issue number5
StatePublished - Mar 11 2014
Externally publishedYes


  • Clinical trial
  • Keratitis
  • Long-term
  • Outcomes
  • Prospective
  • Visual acuity

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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