Comparison of corneal elevation and pachymetry measurements made by two state of the art corneal tomographers with different measurement principles


Autoři: Simon Schröder aff001;  Achim Langenbucher aff001;  Jens Schrecker aff002
Působiště autorů: Institute of Experimental Ophthalmology, Saarland University, Homburg/Saar, Germany aff001;  Department of Ophthalmology, Rudolf-Virchow-Klinikum Glauchau, Glauchau, Germany aff002
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223770

Souhrn

Purpose

To compare corneal tomography measurements (elevation and pachymetry) as made by two corneal tomographers: Pentacam AXL and CASIA 2.

Material and methods

The devices were used in a standard measuring mode. 77 normal eyes were measured five times with both devices. The data maps for anterior and posterior corneal elevation and pachymetry were exported and analyzed. Repeatability and average values were calculated for each valid data point on the exported data maps. We also calculated a corrected repeatability of the elevation data maps by removing rotation, tilt, and decentration through realignment of the elevation measurement of each eye prior to analyzing the variations in the measurement usingthe same method as for the repeatability.

Results

Pentacam AXL offered the better (corrected) repeatability for anterior corneal elevation measurements. CASIA 2 offered better repeatability for the pachymetry measurements. The tomographers could not be used interchangeably. The central corneal thickness was measured 9 μm ± 3 μm larger when measured with Pentacam AXL compared to CASIA 2.

Klíčová slova:

Cornea – Eye diseases – Eye lens – Eyes – Intraocular lens implantation – Measurement equipment – Optical equipment – Tomography


Zdroje

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Článek vyšel v časopise

PLOS One


2019 Číslo 10