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Abstract #12706 Published in IGR 7-3
Evaluation of a rebound tonometer for measuring intraocular pressure in dogs and horses
Knollinger AM; LaCroix NC; Barrett PM; Miller PEJournal of the American Veterinary Medicine Association 2005; 227: 244-8
OBJECTIVE: To compare intraocular pressure (IOP) measurements obtained with a rebound tonometer in dogs and horses with values obtained by means of applanation tonometry and direct manometry. DESIGN: Prospective study. ANIMALS: 100 dogs and 35 horses with clinically normal eyes, 10 enucleated eyes from 5 dogs, and 6 enucleated eyes from 3 horses. PROCEDURES: In the enucleated eyes, IOP measured by means of direct manometry was sequentially increased from 5 to 80 mmHg, and IOP was measured with the rebound tonometer. In the dogs and horses, results of rebound tonometry were compared with results of applanation tonometry. RESULTS: For the enucleated dog and horse eyes, there was a strong (r2 = 0.99) linear relationship between pressures obtained by means of direct manometry and those obtained by means of rebound tonometry. Mean ± SD IOPs obtained with the rebound tonometer were 10.8 ± 3.1 mmHg (range, 5 to 17 mmHg) and 22.1 ± 5.9 mmHg (range, 10 to 34 mmHg) for the dogs and horses, respectively. Mean IOPs obtained with the applanation tonometer were 12.9 ± 2.7 mmHg (range, 8 to 18 mmHg) and 21.0 ± 5.9 mmHg (range, 9 to 33 mmHg), respectively. Values obtained with the rebound tonometer were, on average, 2 mmHg lower in the dogs and 1 mmHg higher in the horses, compared with values obtained with the applanation tonometer. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that the rebound tonometer provides accurate estimates of IOP in clinically normal eyes in dogs and horses.
Dr. A.M. Knollinger, Eye Care for Animals, 1892 E Ft Union Blvd, Salt Lake City, UT 84121, USA
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
