Comparison of three methodologies for measuring intraocular pressure in healthy cats

Vet World Vol.17 August-2024 Article - 17

Research Article

Veterinary World, 17(8): 1803-1809

https://doi.org/10.14202/vetworld.2024.1803-1809

Claudia Lizandra Ricci¹, João Victor Goulart Consoni Passareli¹, Felipe Franco Nascimento¹, Glaucia Prada Kanashiro¹, Luís Felipe da Costa Zulim¹, Rogério Giuffrida¹, and Silvia Franco Andrade^1,2

1. Postgraduate Program in Animal Science, UNOESTE, Presidente Prudente, São Paulo, Brazil.
2. Department of Veterinary Ophthalmology, Veterinary Hospital, UNOESTE, Presidente Prudente, São Paulo, Brazil.

Background and Aim: Measuring intraocular pressure (IOP) is crucial for identifying potentially damaging changes in the eyes, including diseases as glaucoma and uveitis. This study compared intraocular pressure (IOP) measurements in cats using the Tonovet and Tonovet Plus (rebound), Tono-Pen Avia Vet (applanation), and Kowa HA-2 (Goldman’s methodology applanation) tonometers.

Materials and Methods: 55 healthy cats (108 eyes) were assessed through three distinct studies: An ex vivo experiment (10 eyes of five cats) to correlate IOP manometry and tonometry values and ascertain the correlation coefficient (r2); an in vivo study (10 eyes of five sedated cats) to contrast manometer and tonometer readings; and an outpatient clinical trial (80 eyes of 45 cats) to analyze only tonometer measurements.

Results: The r2 values observed in the ex vivo study were Tonovet (0.923), Tonovet Plus (0.925), Tono-Pen Avia Vet (0.877), and Kowa HA-2 (0.901). The IOP values in mmHg in the in vivo study were as follows: Manometer (16.1 ± 2.7), Tonovet (21.1 ± 3.6), Tonovet Plus (19.7 ± 7.2), Tono-Pen Avia Vet (17.6 ± 7.9), and Kowa HA-2 (16.8 ± 2.0). In the outpatient clinical study, the IOP values in mmHg were as follows: Tonovet (19.7 ± 6.6), Tonovet Plus (17.1 ± 5.4), Tono-Pen Avia Vet (16.3 ± 4.3), and Kowa HA-2 (14.5 ± 2.2).

Conclusion: IOP and manometry readings were strongly correlated by all tonometers. In the clinical setting, the most and least IOP measurements were recorded using Tonovet and Kowa HA-2, respectively, stressing the importance of an IOP reference table for each tonometer in feline practice.

Keywords: applanation tonometry, goldmann tonometry, intraocular pressure, ocular manometry, rebound tonometry.

How to cite this article: Ricci CL, Passareli JVGC, Nascimento FF, Kanashiro GP, da Costa Zulim LF, Giuffrida R, and Andrade SF (2024) Comparison of three methodologies for measuring intraocular pressure in healthy cats, Veterinary World, 17(8): 1803-1809.

Received: 2024-05-06 Accepted: 2024-07-18 Published online: 2024-08-20

Corresponding author: Silvia Franco Andrade E-mail: silviafranco@unoeste.br

DOI: 10.14202/vetworld.2024.1803-1809

Copyright: Ricci, et al. This article is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/ by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http:// creativecommons.org/ publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.