Evaluation of corneal elevation, pachymetry and keratometry in keratoconic eyes with respect to the stage of Amsler-Krumeich classification

Abstract

Anterior and posterior corneal surface height data obtained by enhanced ectasia display, effectively discriminates keratoconus from normal corneas. Elevation difference measurements may provide useful information for improving the diagnostic accuracy of keratoconus, especially in the early stage of the disease.

A combination of topographic and pachymetric parameters in keratoconus diagnosis

“…In the keratoconus group, 63 eyes (34.4%) had stage 1, 75 eyes (41%) had stage 2 and 45 eyes (24.6%) had stage 3 keratoconus based on the Amsler-Krumeich classification system [13]. Table 1 presents age, gender distribution and means for the Scheimpflug imaging system parameters (mean K [front], topographic astigmatism, pupil-center pachymetry, apical pachymetry, thinnest pachymetry, corneal volume and Kmax) in the keratoconus and control groups.…”

“…In the keratoconus group, the diagnostic performance of the Kmax 2 /TP ratio was tested in different stages of the disease based on the Amsler-Krumeich classification system (Table 3) [13]. The entire study group consisted of only eyes with ≤ stage 3 keratoconus.…”

“…In the keratoconus group, disease severity was graded according to the Amsler-Krumeich classification system as follows [13]:…”

Scleral lens influence on corneal curvature and pachymetry in keratoconus patients

“…Our topography and pachymetry measurements were performed by Scheimpflug (Pentacam) imaging, which is considered to be a highly reliable device to measure keratometry and pachymetry in keratoconic corneas [22,23]. The repeatability of measurements with the Pentacam is high and in a study by Koller et al [24] the standard deviation of repeated K max ranged from 0.017 to 0.039 mm with a mean of 0.024 mm, which corresponds to a mean of approximately 0.1 D.…”

Assessing Progression of Keratoconus and Cross-linking Efficacy: The Belin ABCD Progression Display

“…Others have used this system with various modification and additions in an attempt to better diagnosis or characterize the severity of disease. 21,22 …”