Search

Objectives: To determine the accuracy and precision of the Icare® TONOVET Plus rebound tonometer and the Tono‐Pen AVIA Vet™ applanation tonometer for intraocular pressure (IOP) measurement in normal ex vivo canine eyes and comparison to earlier models of these tonometers. Animals & procedures: The anterior chambers of six normal dog eyes were cannulated ex vivo. IOP was measured with the TONOVET (TV01), TONOVET Plus, Tono‐Pen Vet™, and Tono‐Pen AVIA Vet™ at manometric IOPs ranging from 5 to 70 mm Hg. Data were analyzed by linear regression, ANOVA and Bland‐Altman plots. A P value ≤.05 was considered significant. Results: Intraocular pressure values obtained using the TONOVET Plus and TV01 were significantly more accurate than with the Tono‐Pen VET and Tono‐Pen AVIA Vet, particularly at higher IOPs (30‐70 mm Hg). Accuracy was not significantly different between any of the devices in the low to normal physiologic IOP range (5‐25 mm Hg). Level of precision was high for all devices, though the TONOVET Plus was more precise than the Tono‐Pen Vet in the 5‐25 mmHg range and the TV01 was more precise than the Tono‐Pen AVIA Vet over the whole IOP range. Conclusions: All devices underestimated IOP, particularly at higher pressures. Rebound tonometers were more accurate over the full range of IOP tested and in the high IOP range; however, there were no significant differences in accuracy among devices in the physiologic IOP range. All tonometers can provide clinically useful IOP readings in dogs, but rebound and applanation tonometers should not be used interchangeably. [ABSTRACT FROM AUTHOR]

To determine the accuracy and precision of the Icare ® TONOVET Plus rebound tonometer for measuring intraocular pressure (IOP) in normal rabbit eyes, as well as compare it to three other commercially available tonometers: the Icare ® TONOVET (TV01), Tono-Pen Vet™, and Tono-Pen AVIA Vet™. The anterior chambers of both eyes of three New Zealand White rabbits were cannulated, post-mortem. IOP was measured using each of the above four tonometers at manometric pressures ranging between 5 mmHg and 70 mmHg. Data were analyzed by linear regression, ANOVA, and Bland-Altman plots. A p-value of ≤0.05 was considered significant for all statistical tests. IOP values obtained with the TONOVET Plus (in 'lapine' mode) were significantly closer to manometric IOP than those obtained with the other tonometers tested. The TV01 (in 'd' dog setting) and Tono-Pen AVIA Vet™ were significantly more accurate compared to the Tono-Pen Vet™. All tonometers had high levels of precision, though the TONOVET Plus and TV01 were significantly more precise compared to the Tono-Pen AVIA Vet™. All tonometers tended to underestimate IOP, particularly at high pressures, however the TONOVET Plus was highly correlated with manometric IOP in the clinically relevant range of 5-50 mmHg. The TONOVET Plus is an appropriate choice of instrument for measuring IOP in rabbit eyes in both research and clinical settings., (Copyright © 2019 Elsevier Ltd. All rights reserved.)