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

Abstract

The aim of this study was to compare the accuracy of Tonovet and Tonovet Plus (rebound), Tono-Pen Avia Vet (applanation) and Kowa (Goldmann applanation) tonometers in dogs. Intraocular pressure (IOP) was measured in 130 eyes of 65 dogs. A post-mortem study was performed comparing manometry versus tonometry values and calculating the correlation coefficient (r2), an in vivo study comparing actual IOP (manometry) with tonometers and an outpatient study in healthy eyes and eyes with signs of glaucoma and uveitis. The results obtained in the postmortem study of (r2) values in decreasing 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: 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); healthy outpatients: 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). We can conclude that there was a strong correlation between IOP values and manometry in all tonometers. The highest values were with Tonovet Plus and the lowest with Kowa HA-2. All tonometers were accurate in measuring IOP in dogs, including the latest Tonovet Plus, which showed an excellent correlation coefficient.