Comparison between color light‐emitting diode corneal topographer and scheimpflug imager in measuring corneal astigmatism and corneal higher order aberrations

Abstract

AbstractPurposeTo compare corneal astigmatism magnitude, axis, keratometry, and corneal anterior aberrations between the light emitting diode corneal topography analyzer (Cassini) and Scheimpflug Imager (pentacam).MethodsThis prospective study involved 45 eyes of healthy individuals from Seoul St. Mary’s hospital. For each eye, keratometry, astigmatism and its axis of anterior, posterior and total cornea, higher order aberrations were evaluated with a Scheimpflug Imager (Pentacam HR; Oculus, Wetzlar, Germany) and a color‐LED corneal topographer (Cassini; i‐Optics, The Hague, The Netherlands)ResultsAstigmatism magnitude measured using Cassini® and Pentacam® showed no statistically different but anterior and total astigmatic axis were significantly different between two devices (p < 0.05). Anterior and total mean keratometry were statistically significantly different between two devices (p < 0.05) and J0 and J45 vectors of anterior and total cornea were statistically different (p < 0.05). In addition, Cassini® and Pentacam® showed a discrepancy among total corneal astigmatism, total J0 and J45 vectors. Corneal anterior spherical aberration, vertical and horizontal coma, oblique and horizontal trefoil aberrations were not statistically different between 2 devices.ConclusionsAstigmatic axis obtained from the two devices based on different principles showed significantly differences. Astigmatism magnitude was not statistically different but showed a discrepancy between two devices.