Spiess
Fakultäten » Vetsuisse-Fakultät » Departement für Pferde » Ophthalmologie » Prof. Dr. Bernhard M. Spiess » Spiess
Completed research project
| Title / Titel | Evaluation of a rebound tonometer in clinically normal cat eyes | ||||
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| Abstract (PDF, 14 KB) | |||||
| Summary / Zusammenfassung | Objective The purpose of this study was to determine the accuracy of a rebound tonometer in normal feline eyes in vitro, to establish reference values for the rebound tonometer and to evaluate the effect of topical anesthesia on rebound tonometry. Rebound and applanation tonometers were also compared in vitro and in vivo. Procedures Six enucleated eyes from three cats were used to compare both tonometers with direct manometry. Intraocular pressure (IOP) was measured in 100 cats to establish reference values for rebound tonometry. Smaller groups were used to compare rebound tonometry with and without topical anesthesia as well as to compare the rebound and applanation tonometers. 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 0-30 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 The rebound tonometer correlated well with direct manometry and was well tolerated by cats. It appears suitable for glaucoma diagnosis with good agreement in the clinically important pressure range of 25-50 mmHg. 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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| Publications / Publikationen | Rusanen, E., Florin, M., Hässig, M, Spiess, B.M. (2010): Evaluation of a rebound tonometer (Tonovet®) in clinically normal cat eyes. Vet. Ophthalmol. 13(1): 31-36 |
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| Keywords / Suchbegriffe | intraocular pressure, cat, rebound tonometry, applanation tonometry, direct manometry | ||||
| Project leadership and contacts / Projektleitung und Kontakte |
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| Funding source(s) / Unterstützt durch |
Private Sector (e.g. Industry), Others |
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| Duration of Project / Projektdauer | Jul 2007 to Jul 2008 |