ESCRS - POANT007 - Repeatability And Inter-Device Agreement Of Four Corneal Tomography Platforms In Healthy Eyes

Repeatability And Inter-Device Agreement Of Four Corneal Tomography Platforms In Healthy Eyes

Published 2026 - 44th Congress of the ESCRS

Reference: POANT007 | Type: Free paper | DOI: 10.82333/d0sy-r570

Authors: Dr Tatiana Andrea Arevalo-Barboza* 1 , Dr Lisett Perez 1 , Dr Guillermo Raul Vera-Duarte 1 , Mr Jose Chauca 2 , Dr Luis Izquierdo Jr. 3 , Dr Maria A. Henriquez 1

1Research Department,Oftalmosalud Institute of Eye,Lima,Peru, 2Research Department,Oftalmosalud Institute of Eye,Lima,Peru;Department of Statistics, Demography, Humanities and Social Sciences,Universidad Peruana Cayetano Heredia,Lima,Peru, 3Research Department,Oftalmosalud Institute of Eye,Lima,Peru;San Fernando School of Medicine,Universidad Nacional Mayor de San Marcos,Lima,Peru

Purpose

To quantify intra-device repeatability and inter-device agreement of corneal astigmatism magnitude and axis, and steep keratometry (K2), across four corneal tomography platforms in healthy eyes.

Setting

Research Department, Oftalmosalud Institute of Eyes, Lima, Perú.

Methods

Prospective, cross-sectional reliability and inter-device agreement study. A single examiner acquired three consecutive scans per eye in randomized device order using a rotating Scheimpflug camera (Pentacam HR), a Placido–Scheimpflug hybrid (Sirius), a dual rotating Scheimpflug–Placido system (Galilei G4), and a spectral-domain AS-OCT with Placido topography (MS-39). Primary outcomes were corneal astigmatism magnitude (D) and axis (°). Repeatability was summarized with within-subject SD (Sw) and repeatability coefficient (RC=2.77×Sw). Inter-device agreement used ICC and pairwise differences; Bland–Altman was applied to scalar parameters.

Results

Ninety-six eyes of 48 healthy participants (mean age 32.23±6.10 years; 64.6% female) were included. Intra-device repeatability for astigmatism magnitude was Sw 0.127–0.277 D and RC 0.353–0.768 D. Between devices, differences in astigmatism magnitude showed RC 0.456–0.732 D, whereas axis differences were larger (K2-axis RC 10.786–18.942°). Anterior K2 showed high repeatability (RC 0.312–0.540 D) and excellent inter-device reproducibility (ICC 0.995, 95% CI 0.979–0.998). Inter-device ICC for anterior astigmatism magnitude was 0.992, while axis ICCs were lower (K1 0.918, K2 0.912; all p<0.001)..

Conclusions

In healthy eyes, corneal astigmatism magnitude and steep keratometry are highly repeatable within devices and reproducible across platforms, whereas axis orientation shows larger between-device variability.