Repeatability and intrasession reproducibility obtained by the Sirius anterior segment analysis system

Area of Science:

• Ophthalmology
• Medical Imaging
• Biomedical Optics

Background:

• Accurate anterior segment measurements are crucial for diagnosing and managing various ocular conditions.
• The Sirius Scheimpflug system is a novel device for anterior segment analysis.

Purpose of the Study:

• To evaluate the repeatability and intrasession reproducibility of anterior segment measurements obtained with the Sirius Scheimpflug system.
• To assess the reliability of parameters including anterior chamber angle (ACA), anterior chamber volume (ACV), anterior chamber depth (ACD), thinnest corneal location, and keratometry.

Main Methods:

• Fifty healthy subjects (100 eyes) underwent three consecutive measurements using the Sirius device in a single session.
• Repeatability was assessed using coefficient of variation (CV), and intrasession reproducibility was evaluated with intraclass correlation coefficient (ICC).

Main Results:

• High repeatability (CV ≤ 2%) and reproducibility (high ICC) were observed for ACA, ACD, thinnest corneal location, and anterior keratometry.
• ACV, posterior keratometry, and posterior cylinder/axis showed higher CV and lower ICC, indicating less reliability for these specific parameters.

Conclusions:

• The Sirius Scheimpflug system exhibits high repeatability and intrasession reproducibility for key anterior segment parameters (ACD, ACA, anterior curvature, thinnest corneal location).
• These findings support the confident clinical application of the Sirius system for routine ophthalmic examinations.