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Longitudinal changes in corneal curvature in keratoconus.

Timothy T McMahon1, Timothy B Edrington, Loretta Szczotka-Flynn

  • 1Department of Ophthalmology & Visual Sciences, University of Illinois College of Medicine at Chicago, Chicago, IL, USA.

Cornea
|April 25, 2006
PubMed
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Younger age and poorer vision predict worsening corneal curvature in keratoconus patients. This progression, measured by First Definite Apical Clearance Lens (FDACL) and flatter keratometric reading (Flat K), indicates a need for closer monitoring in at-risk individuals.

Area of Science:

  • Ophthalmology
  • Corneal Disease
  • Keratoconus Research

Background:

  • Keratoconus is a progressive condition characterized by thinning and bulging of the cornea.
  • Understanding factors influencing corneal curvature changes is crucial for managing keratoconus.
  • Longitudinal data from large patient cohorts are essential for identifying predictive markers.

Purpose of the Study:

  • To identify predictors of longitudinal increases in corneal curvature in keratoconus.
  • To analyze changes measured by First Definite Apical Clearance Lens (FDACL) and flatter keratometric reading (Flat K).
  • To determine factors associated with significant diopter increases in corneal curvature.

Main Methods:

  • Utilized 8 years of follow-up data from 1032 keratoconus patients in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study.

Related Experiment Videos

  • Calculated the slope of change over time for FDACL and Flat K.
  • Assessed the incidence of increases of 3.00 diopters or more in FDACL or Flat K.

    • Main Results:

    • Over 8 years, FDACL increased by an average of 1.44 D and Flat K by 1.60 D.
    • A significant increase (≥3.00 D) occurred in 24.8% for FDACL and 24.1% for Flat K.
    • Younger age, poorer baseline high-contrast visual acuity, and non-white race predicted increased FDACL; younger age and poorer visual acuity predicted significant increases in both measures.

    Conclusions:

    • Keratoconus patients demonstrate a slow but consistent increase in corneal curvature over time.
    • Younger age and reduced baseline visual acuity are key predictors of accelerated corneal curvature changes.
    • These findings highlight the importance of early detection and monitoring in younger individuals with keratoconus.