# Comparative Assessment of Corneal Imaging Devices for Pediatric Patients: Evaluating Keratometric Measurements and Wavefront Aberrations

## TL;DR

This study compares three corneal imaging devices in children, finding that the Pentacam is most reliable for measuring eye shape and aberrations, though agreement between devices is poor in certain conditions.

## Contribution

The study provides a comparative assessment of corneal imaging devices in pediatric patients with diverse clinical conditions.

## Key findings

- The Pentacam demonstrated superior repeatability for aberrometry indices in keratoconus patients.
- Repeatability was significantly reduced in Down syndrome patients for specific parameters.
- Agreement between devices was poor for key indices in keratoconus and Down syndrome groups.

## Abstract

To evaluate the intrasession repeatability and agreement in keratometric and wavefront measurements among three different instruments (Pentacam HR, Nidek OPD-Scan III [OPD], and Zeiss i-Profiler
Plus
[IPROF]) in a pediatric population with various clinical features.

This cross-sectional study included 217 eyes from 114 patients aged 6 to 17 years with different clinical features. The patients were divided into five groups: one control group (C) and four other groups, each presenting with keratoconus (KC), ocular allergy (OA), high astigmatism, or Down syndrome (DS). Statistical analyses included the intraclass correlation coefficient (ICC) for repeatability and Bland-Altman plots for agreement.

The findings demonstrated excellent repeatability of keratometric parameters across all devices (e.g., K1 ICC: 99.53% for Pentacam, 98.10% for OPD, and 98.31% for IPROF). The Pentacam showed superior repeatability for aberrometry indices in the KC group, with ICC values exceeding 98% for high-order aberration root mean square (HOA RMS) and Zernike polynomials. However, in the DS group, repeatability was significantly reduced for certain parameters, such as the index of surface variance (ICC: 40.13%) and HOA RMS (ICC: 42.86%). Bland-Altman plots revealed variations among devices in asphericity, vertical coma, and HOA RMS, with the KC group exhibiting broader limits of agreement compared to the control group.

All three instruments showed good repeatability, with the Pentacam demonstrating superior reliability across all parameters, including aberrometry. However, agreement between devices was poor for key indices in patients with KC and DS.