Abstract
This study examines agreement between the devices Anterion® and Pentacam HR® used for corneal and pupil measurements in healthy eyes. The parameters compared between the two devices were: anterior Km (D), anterior K2 (D), anterior K1 (D), anterior K1 axis (°), anterior astigmatism (D), anterior K max (D), posterior Km (D), posterior K2 (D), posterior K1 (D), posterior K1 axis (°), posterior astigmatism (D), CCT (µm), thinnest point thickness (µm), thinnest point X-coordinate (mm), thinnest point Y-coordinate (mm), pupil diameter (mm), pupil center-corneal vertex distance (mm) (angle kappa), pupil centroid angle (°), pupil centroid X-coordinate (mm), and pupil centroid Y-coordinate (mm). The Student’s t test for independent samples identified significant differences (p < 0.005) between devices for the measurements anterior and posterior flat K axis, posterior flat K, steep K, and mean K. For these last three measurements, although significant, none of the differences were clinically relevant. Corneal power and thickness measurements except Kf axis showed excellent agreement between Anterion and Pentacam. In a clinical setting we would not recommend the interchangeable use of Pentacam and Anterion for measurement of pupil parameters.
Highlights
Precise measurement of both corneal power and pupil diameter has progressively gained importance in parallel with the development of cataract and refractive surgery procedures [1]
The cornea display of the device offers a wide range of anterior segment parameters such as anterior and posterior keratometry, central corneal thickness, elevation measures, and pupil size
Anterior segment measurements are used as cut-offs for patient and ocular surgical method selection
Summary
Precise measurement of both corneal power and pupil diameter has progressively gained importance in parallel with the development of cataract and refractive surgery procedures [1]. Central corneal thickness (CCT), and mean (Km), flat (Kf) and steep (Ks) keratometry, along with pupil diameter (PD), are main determining factors for excimer laser ablation and/or multifocal intraocular lens (MIOL) implantation [2,3]. Optikgeräte GmbH), a rotating Scheimpflug camera system designed to visualize the anterior segment that is able to measure corneal topography, elevation of the anterior and posterior corneal surface, corneal thickness, and anterior chamber angle [1,4]. Through anterior segment swept-source optical coherence tomography (OCT), it can be used to measures axial length for ocular biometry and can be used to image the anterior segment. The cornea display of the device offers a wide range of anterior segment parameters such as anterior and posterior keratometry, central corneal thickness, elevation measures, and pupil size
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