Dual‐Scheimpflug‐Placido‐disc corneal analysis in cats

Abstract

Objective: To evaluate the corneal topography and tomography of cats using a dual Scheimpflug and Placido disc device.Animal studied: Sixteen mixed-breed cats (32 eyes).Procedure(s): Cats were sedated using meperidine (4.3 mg/kg/IM) and xylazine (0.5 mg/kg/IM), and evaluated using the software Galilei™. Values assessed included anterior and posterior corneal curvature, total corneal power, and corneal thickness.Results: Ten males and six females aged between 18 and 48 months were evaluated. The simulated keratometry (SimK) was 38.37 ± 0.83D, mean posterior keratometry −4.89 ± 0.34D, and mean total corneal power 38.04 ± 0.94D. The mean central corneal thickness (CCT) was 617.34 ± 53.38 μm with a mean thinnest point of 583.74 ± 60.60 μm. Conclusion:The Galilei™ examination was feasible in cats, enabling a detailed study of the cornea. To the best of our knowledge, this is the first study evaluating the corneal topography and tomography of cats using a device that integrates data from a dual Scheimpflug and Placido disc system.

Simulated keratometry and central corneal thickness measured in cats by autokeratometer, ultrasonic pachymeter, and Galilei G6™

“…There are many devices available in clinical practice for measuring corneal pachymetry and keratometry 8–11 . In cats, corneal thickness has been measured using optical pachymetry, 12 ultrasonic pachymetry, 13–17 ultrasonic biomicroscopy, 18,19 specular microscopy, 17 optical coherence tomography, 20,21 single Scheimpflug device (Pentacam‐HR), 20 and dual Scheimpflug device (Galilei) 22 . Keratometry has been described in cats using a keratometer 18,23,24 and Galilei 22 …”

“…[8][9][10][11] In cats, corneal thickness has been measured using optical pachymetry, 12 ultrasonic pachymetry, [13][14][15][16][17] ultrasonic biomicroscopy, 18,19 specular microscopy, 17 optical coherence tomography, 20,21 single Scheimpflug device (Pentacam-HR), 20 and dual Scheimpflug device (Galilei). 22 Keratometry has been described in cats using a keratometer 18,23,24 and Galilei. 22 There are studies in medical ophthalmology comparing simulated keratometry (SimK) and central corneal thickness (CCT) measured by different devices in order to support specific interpretations for each system, but studies like these are lacking in veterinary ophthalmology.…”

“…22 Keratometry has been described in cats using a keratometer 18,23,24 and Galilei. 22 There are studies in medical ophthalmology comparing simulated keratometry (SimK) and central corneal thickness (CCT) measured by different devices in order to support specific interpretations for each system, but studies like these are lacking in veterinary ophthalmology. It is important to consider that, despite measuring the same parameter, the devices may provide values that may be or may not be used interchangeably.…”

“…8,11,26,29 There are few studies in veterinary ophthalmology using the Galilei. Ramos et al 22 have described anterior and posterior curvature, total corneal power, and corneal thickness of cats' cornea using the software Galilei G4™. Dong et al 31 described the CCT of rabbits' cornea using the Galilei.…”