Intrasubject repeatability of corneal power, thickness, and wavefront aberrations with a new version of a dual rotating Scheimpflug–Placido system

Abstract

No author has a financial or proprietary interest in any material or method mentioned.

Corneal Topographic and Aberrometric Measurements Obtained with a Multidiagnostic Device in Healthy Eyes: Intrasession Repeatability

“…These intrasession repeatability outcomes are similar to those reported with other commercially available Scheimpflug imaging-based systems [2–14]. Montalbán et al [6] found S w values of 0.4 mm or lower (~0.20 D) and ICC of more than 0.990 for repeated measurements of anterior and posterior corneal curvature obtained in normal healthy eyes with the Sirius system from CSO (Firenze, Italy).…”

“…This level of consistency is similar or even better than that reported for other commercially available multidiagnostic platforms [2, 5, 6, 15, 16]. Cerviño et al [2] found an ICC value of 0.811 for the magnitude of corneal astigmatism obtained in normal healthy eyes with the Galilei dual Scheimpflug-Placido analyzer. Similarly, moderate ICC values were found by Masoud et al [15] for corneal astigmatism in normal healthy eyes using the Sirius system.…”

“…There are scientific evidence confirming the consistency of corneal measurements provided by different commercially available multidiagnostic devices based on Scheimpflug imaging [2–6]. The VX120 is a new multidiagnostic platform combining Scheimpflug imaging with Placido disk, Hartmann-Shack, and air-puff tonometry technologies.…”

“…These same authors also reported slightly poorer intrasession consistency of corneal curvature measurements with the same system in keratoconus eyes [5]. Cerviño et al [2] reported ICC values of more than 0.950 for anterior and posterior corneal curvature measurements obtained in normal healthy eyes with the Galilei dual Scheimpflug-Placido analyzer from Ziemer Ophthalmic Systems AG (Switzerland). Kim et al [7] reported for the same dual Scheimpflug-Placido system S w values of 0.08 and 0.09 D for simulated keratometry in normal healthy and postrefractive surgery eyes, respectively.…”

“…Specifically, these advanced devices provide an analysis of the shape and optical aberrations of the two surfaces of the cornea, a characterization of the distribution of corneal thickness, and even a volumetric analysis [1]. Concerning the geometric analysis of the anterior corneal surface, the combination of Scheimpflug imaging and Placido disk technologies has been demonstrated to be useful for obtaining consistent curvature and elevation data in normal healthy and even in keratoconus eyes [2–6]. Recently, a new multidiagnostic platform has been developed that provides automatic measurements of corneal topography, corneal, internal and ocular aberrations, pachymetry, anterior chamber depth, iridocorneal angle, pupil diameter under different luminance conditions, and intraocular pressure (IOP), which is the VX120 system (Visionix-Luneau Technologies, Chartres, France).…”