Keratoconus detection using corneal topography

J Refract Surg. 2009 Oct;25(10 Suppl):S958-62. doi: 10.3928/1081597X-20090915-11.


PURPOSETo review the topographic patterns associated with keratoconus suspects and provide criteria for keratoconus screening.

Methods: Case study using maps from the NIDEK OPD-Scan II and OPD Station to highlight patterns seen in keratoconic corneas.

Results: Five criteria are listed for the detection of keratoconus: 1) apex of the cone is not centered at the 6-o'clock semi-meridian, 2) cone should appear round on the tangential map, 3) keratometry >45.00 diopters, 4) corneal thickness at the apex of the cone is approximately 30 microm thinner than the corresponding distance above the pupil center, and 5) topographic patterns are not symmetric.

Conclusions: Standard corneal topography maps and simple clinical evaluation criteria are fundamental to detect keratoconus suspects and keratoconus.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Cornea / pathology*
  • Corneal Topography / methods*
  • Humans
  • Keratoconus / diagnosis*
  • Male