Visual acuity in patients with keratoconus: a comparison with matched regular myopic astigmatism

Michael Mimouni, Riham Najjar, Gilad Rabina, Igor Vainer, Igor Kaiserman

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To compare uncorrected distance visual acuity (UDVA) and best-corrected distance visual acuity (CDVA) between patients with keratoconus (KC) and matched patients with regular myopic astigmatism. Methods: This retrospective study included consecutive patients diagnosed with KC between 2008 and 2013 at Care-Vision Laser Centers, Tel-Aviv, Israel, and matched patients with regular myopic astigmatism. Data included were central corneal thickness (CCT), spherical equivalent (SE), cylinder (CYL), mean keratometric power, maximum keratometric power (K max ), UDVA, CDVA, and defocus equivalent (DEQ). Results: The KC group included 734 patients with a mean age of 33.8 ± 9.5 years. The matched, control group included 1462 patients with a mean age of 33.2 ± 9.7 years (p = 0.14). The mean SE and CYL of the KC group were − 3.34 ± 3.29D and − 3.01 ± 1.99D, respectively, compared to − 3.34 ± 2.92D (p = 0.98) and − 2.97 ± 1.35 (p = 0.58). Mean K (46.8 ± 3.3D versus 44.0 ± 1.8D, p < 0.0001) and K max (48.4 ± 4.0D versus 45.3 ± 2.0D, p < 0.0001) were statically significant higher in the KC group. CCT was significantly thinner in the KC group (444 ± 49 versus 527 ± 40 μm, p < 0.0001). The KC group had a better UDVA than the non-KC group (1.10 ± 0.68 versus 1.22 ± 0.64 logMAR, p < 0.0001). CDVA was significantly lower in the KC group (p < 0.001). Conclusions: For defocus equivalents above 6D, the KC group had better UDVA than the non-KC group in spite of worse CDVA.

Original languageEnglish
Pages (from-to)313-319
Number of pages7
JournalGraefe's Archive for Clinical and Experimental Ophthalmology
Volume257
Issue number2
DOIs
StatePublished - 4 Feb 2019

Keywords

  • Astigmatism
  • CDVA
  • Defocus equivalent
  • Keratoconus
  • UDVA

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