Comparison among TonoVet, TonoVet Plus, Tono-Pen Avia Vet, and Kowa HA-2 portable tonometers for measuring intraocular pressure in dogs

Vet World Vol.14 September-2021 Article-20

Research Article

Veterinary World, 14(9): 2444-2451

https://doi.org/10.14202/vetworld.2021.2444-2451

João Victor Goulart Consoni Passareli¹, Felipe Franco Nascimento¹, Giovana José Garcia Estanho¹, Claudia Lizandra Ricci¹, Glaucia Prada Kanashiro¹, Rogério Giuffrida¹, and Silvia Franco Andrade²

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: Tonometers are an important instrument for measuring intraocular pressure (IOP) in the diagnosis of glaucoma or uveitis. This study aimed to compare the accuracy of the main types of tonometers with different IOP measurement methodologies in dogs: TonoVet and TonoVet Plus (rebound), Tono-Pen Avia Vet (applanation), and Kowa HA-2 (Goldmann applanation).

Materials and Methods: IOP was measured in 152 eyes of 76 dogs. A postmortem study was performed by comparing manometry and tonometry values and calculating the correlation coefficient (r2), in vivo real IOP (manometry) among the tonometers was compared, and an outpatient study was conducted with healthy eyes and eyes with signs of glaucoma and uveitis.

Results: In the postmortem study, the values of r2 in descending order were Kowa (0.989), TonoVet Plus (0.984), TonoVet (0.981), and Tono-Pen Avia Vet (0.847). The IOP values in mmHg in the in vivo study were as follows: Aneroid manometer (16.8±2.5.7), TonoVet (18.1±2.9), TonoVet Plus (20.6±2.3), Tono-Pen Avia Vet (17.1±2.5), and Kowa (16.1±1.7); in outpatient clinics: TonoVet (16.8±3.8), TonoVet Plus (19.2±2.9), Tono-Pen Avia Vet (16.2±2.4), and Kowa (15.0±1.3); glaucoma: TonoVet (30.2±3.5), TonoVet Plus (35.0±6.1), Tono-Pen Avia Vet (29.5±4.2), and Kowa (23.9±5.0); and uveitis: TonoVet (14.2±1.4), TonoVet Plus (17.6±1.9), Tono-Pen Avia Vet (13.7±2.1), and Kowa (12.6±1.7).

Conclusion: There was a strong correlation between IOP values and manometry in all the tonometers. The highest values were obtained with TonoVet Plus and the lowest with Kowa HA-2. All tonometers accurately measured IOP in dogs, including the latest TonoVet Plus, which showed an excellent correlation coefficient. Keywords: applanation tonometry, direct manometry, dogs, Goldmann tonometry, rebound tonometry.

Keywords: applanation tonometry, direct manometry, dogs, Goldmann tonometry, rebound tonometry.

How to cite this article: Passareli JVGC, Nascimento FF, Estanho GJG, Ricci CL, Kanashiro GP, Giuffrida R, Andrade SF (2021) Comparison among TonoVet, TonoVet Plus, Tono-Pen Avia Vet, and Kowa HA-2 portable tonometers for measuring intraocular pressure in dogs, Veterinary World, 14(9): 2444-2451.

Received: 10-05-2021 Accepted: 04-08-2021 Published online: 21-09-2021

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

DOI: 10.14202/vetworld.2021.2444-2451

Copyright: Passareli JVGC, 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.