Work

Corneal astigmatism agreement between a swept-source ocular coherence tomography and Scheimpflug–Placido based optical biometers

Year: 2025

Type: article

Abstract: Purpose This prospective and comparative study assesses the agreement of anterior, posterior, and total corneal astigmatism measurements between swept-source optical coherence tomography (Anterion) and Scheimpflug cameras, Placido disc, and OCT-based tomography (Galilei G6). Methods A total of 59 eyes of 59 patients were assessed using two optical biometers. Anterior, posterior, and total keratometry measurements were obtained, and flat (K1), steep (K2), astigmatic power, and J vectors (J 0 and J 45 ) were compared. Bland–Altman plots and intraclass correlation coefficients (ICC) were used to evaluate agreement and reliability between the devices. Results Statistically significant differences were found for flat keratometry measurements of anterior corneal power (Galilei G6: 43.41 ± 1.78; Anterion: 43.32 ± 1.73) and total corneal power (Galilei G6: 42.41 ± 1.85; Anterion: 42.84 ± 1.81), as well as for steep keratometry of posterior corneal power (Galilei G6: − 6.41 ± 0.38; Anterion: − 6.31 ± 0.30) and total corneal power (Galilei G6: 43.69 ± 1.89; Anterion: 43.91 ± 1.89) ( p < .05). In contrast, no statistically significant differences were found for the mean power vector components comparison between the devices. Agreement analysis showed significant proportional bias for cylindrical power and vector components (J 0 and J 45 ) of posterior and total astigmatism. No bias was observed with any of the anterior astigmatism and vector components. ICC showed showed relatively poor reliability (ICC < 0.5) between the device measurements moderate reliability for posterior corneal parameters. Conclusion Anterior, posterior, and total astigmatism measurements between the Anterion and Galilei G6 are not interchangeable.

Source: International Ophthalmology

DOI: 10.1007/s10792-025-03435-3

Authors: Cameron McLintock, Samir Uprety, James McKelvie

Institutions: The University of Queensland, Princess Alexandra Hospital, University of Auckland

Language: English

Topic: Corneal surgery and disorders

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,790