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Evaluation of a rebound tonometer (Tonovet®) in clinically normal cat eyes


Rusanen, E; Florin, M; Hässig, M; Spiess, B M (2010). Evaluation of a rebound tonometer (Tonovet®) in clinically normal cat eyes. Veterinary Ophthalmology, 13(1):31-36.

Abstract

Objective: To determine the accuracy of and to establish reference values for a rebound tonometer (Tonovet ) in normal feline eyes, to compare it with an applanation
tonometer (Tonopen Vet ) and to evaluate the effect of topical anesthesia on rebound tonometry.
Procedures: Six enucleated eyes were used to compare both tonometers with direct manometry. Intraocular pressure (IOP) was measured in 100 cats to establish
reference values for rebound tonometry. Of these, 22 cats were used to compare rebound tonometry with and without topical anesthesia and 33 cats to compare the rebound and applanation tonometers. All evaluated eyes were free of ocular disease.
Results: Both tonometers correlated well with direct manometry. The best agreement with the rebound tonometer was achieved between 25–50 mmHg. The applanation
tonometer was accurate at pressures between 0 and 30 mmHg. The mean IOP in clinically normal cats was 20.74 mmHg with the rebound tonometer and 18.4 mmHg with the applanation tonometer. Topical anesthesia did not significantly affect
rebound tonometry.
Conclusions: As the rebound tonometer correlated well with direct manometry in the clinically important pressure range and was well tolerated by cats, it appears suitable
for glaucoma diagnosis. The mean IOP obtained with the rebound tonometer was 2–3 mmHg higher than that measured with the applanation tonometer. This difference is within clinically acceptable limits, but indicates that the same type of tonometer should be used in follow-up examinations in a given cat.

Objective: To determine the accuracy of and to establish reference values for a rebound tonometer (Tonovet ) in normal feline eyes, to compare it with an applanation
tonometer (Tonopen Vet ) and to evaluate the effect of topical anesthesia on rebound tonometry.
Procedures: Six enucleated eyes were used to compare both tonometers with direct manometry. Intraocular pressure (IOP) was measured in 100 cats to establish
reference values for rebound tonometry. Of these, 22 cats were used to compare rebound tonometry with and without topical anesthesia and 33 cats to compare the rebound and applanation tonometers. All evaluated eyes were free of ocular disease.
Results: Both tonometers correlated well with direct manometry. The best agreement with the rebound tonometer was achieved between 25–50 mmHg. The applanation
tonometer was accurate at pressures between 0 and 30 mmHg. The mean IOP in clinically normal cats was 20.74 mmHg with the rebound tonometer and 18.4 mmHg with the applanation tonometer. Topical anesthesia did not significantly affect
rebound tonometry.
Conclusions: As the rebound tonometer correlated well with direct manometry in the clinically important pressure range and was well tolerated by cats, it appears suitable
for glaucoma diagnosis. The mean IOP obtained with the rebound tonometer was 2–3 mmHg higher than that measured with the applanation tonometer. This difference is within clinically acceptable limits, but indicates that the same type of tonometer should be used in follow-up examinations in a given cat.

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30 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Equine Department
05 Vetsuisse Faculty > Veterinary Clinic > Department of Farm Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Language:English
Date:January 2010
Deposited On:01 Feb 2010 14:16
Last Modified:05 Apr 2016 13:50
Publisher:Wiley-Blackwell
ISSN:1463-5216
Additional Information:The definitive version is available at www.blackwell-synergy.com
Publisher DOI:10.1111/j.1463-5224.2009.00752.x
Permanent URL: http://doi.org/10.5167/uzh-29065

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