Comparative Study between Corvis ST, Pentacam and Ultrasound Pachymetry in Measurement of Central Corneal Thickness

Hegazy, Hassan; Noureldeen, Tamer; Abbas, Ezzat; Elgendy, Safwat

doi:10.58675/2682-339X.2857

	Comparative Study between Corvis ST, Pentacam and Ultrasound Pachymetry in Measurement of Central Corneal Thickness
Al-Azhar International Medical Journal
Volume 2025, Issue 1, January 2025
DOI: 10.58675/2682-339X.2857
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Authors
Hassan Hegazy¹; Tamer Noureldeen²; Ezzat Abbas¹; Safwat Elgendy²
¹Ophthalmology, Faculty of Medicine for Boys, Al-Azhar University, Cairo, Egypt
²Ophthalmology, Research Institute of Ophthalmology, Giza, Egypt
Abstract
Background: Central corneal thickness (CCT) measurements are important for determining intraocular pressure (IOP), examining corneal endothelium activity, and assessment of patients before and after refractive surgery. Noncontact and contact techniques can be used to assess CCT. Aim of the study: To compare CCT measurements obtained by Corvis ST, Pentacam, and ultrasound pachymetry Subjects and methods; This is observational prospective cross-sectional study, done at the outpatient clinics of Research institute of ophthalmology hospital on 200 healthy eyes. all patients subjected to pentacam, corvis st and ultrasound pachymeter to measure the CCT. Results: Excellent intra-operator reproducibility was demonstrated by the CCT measurements made with Corvis ST for both operators. When evaluating the agreement between Pentacam and Corvis ST in measuring central corneal thickness, ICC ranged from 0.82 to 0.984, which reflected excellent reliability. When evaluating the agreement between Pachypen and CORVIS in measuring central corneal thickness, ICC ranged from 0.236 to 0.975, which reflected excellent reliability. When evaluating the agreement between the pentagram and US pachymetry in measuring central corneal thickness, ICC ranged from 0.616 to 0.895, which reflected good reliability. Conclusion: Corvis ST demonstrated good interoperator and intraoperator repeatability for CCT measurements in healthy eyes. Excellent agreement between Corvis ST and Pentacam indicates that the two instruments could be used interchangeably for CCT measurements in a clinical context. However, because of the relatively wide 95% LoA, the CCT values obtained using ultrasonic pachymetry and Corvis ST are not directly interchangeable.


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