Repeatability and Reproducibility of Anterior Segment Measurements in Normal Eyes Using Dual Scheimpflug Analyzer

Area of Science:

• Ophthalmology
• Optometry
• Biomedical optics

Background:

• Accurate anterior segment measurements are crucial for diagnosing and managing various ocular conditions.
• Dual Scheimpflug analyzer systems offer advanced capabilities for detailed corneal and anterior chamber analysis.

Purpose of the Study:

• To evaluate the repeatability and reproducibility of anterior segment measurements obtained using the Galilei dual Scheimpflug analyzer.
• To assess the reliability of aberrometric measurements provided by the system in normal eyes.

Main Methods:

• Three repeated measurements were performed by two independent examiners on 30 normal eyes.
• Evaluated parameters included corneal power, higher-order aberrations, pachymetry, and anterior chamber depth (ACD).
• Repeatability was assessed using standard deviation and intraclass correlation coefficient (ICC); reproducibility was evaluated using Bland-Altman analysis.

Main Results:

• The Galilei system demonstrated high repeatability and reproducibility for corneal pachymetry and ACD.
• Acceptable ICC values were obtained for most parameters by both examiners.
• Small variability was observed between examiners for all measurements, with minor exceptions for posterior corneal astigmatism and total higher-order aberrations.

Conclusions:

• The Galilei dual Scheimpflug analyzer provides reliable measurements of anterior segment parameters.
• The system is suitable for routine clinical application and research purposes in ophthalmology.