Comparação entre os tonômetros portáteis Tonovet, Tonovet Plus, Tono-Pen Avia Vet e Kowa HA-2 na mensuração da pressão intraocular em cavalos

Abstract

The aim of the present study was to compare and evaluate portable tonometers accuracy with different methodologies, Tonovet, Tonovet Plus, Tono-Pen Avia Vet and Kowa HA-2 in measuring IOP in horses. Measurement of intraocular pressure (IOP) is important for ophthalmopathies diagnosis that can lead to irreversible animal blindness, such as those lead to IOP increase, in glaucoma or its decrease, in uveitis. Diagnosis is performed mainly with tonometers that measure the IOP, applanation and rebound tonometry are the most used nowadays in Veterinary Medicine, represented by the portable tonometers Tono-Pen Avia Vet (applanation), Tonovet (rebound), more recently Tonovet Plus (rebound) and Kowa Ha-2 (Goldmann methodology). Twelve eyes from 6 sedated horses were used for in vivo study comparing actual IOP (manometry) with tonometry, and 60 healthy eyes from 30 healthy unsedated horses in a field study with IOP measured with different tonometers. In vivo study, the IOP values in mmHg measured in ocular manometry were: 24.9±4.0 (20.0-30.0) and in tonometry: Tonovet 25.7±5.8 (19.5-33 .0), Tonovet Plus 24.8±7.1 (13.2-33.2), Tono-Pen Avia Vet 19.2±4.7 (13.1-26.5), Kowa HA-2 24 0.1±1.2 (22.8-25.8); in field study the IOP values were: Tonovet 30.7±5.6 (21.7-38.0), Tonovet Plus 29.6±6.7 (16.2-38.6), Tono-Pen Avia Vet 27.3±5.8 (14.6-37.1), Kowa HA-2 23.4±2.2 (20.2-28.7). There was a strong correlation between IOP values and manometry in all tonometers. Higher IOP values were measured with Tonovet Plus and Tonovet and lower values with Tono-Pen Avia Vet and Kowa HA-2. All tonometers used were accurate in measuring the IOP of horses, specifically the most recent tonometer, the Tonovet Plus, which showed an excellent correlation with manometry.