Peer-reviewed veterinary case report
Comparing eye pressure tests in dogs and cats with Tono-Pen XL
By Andrade, Silvia Franco et al.·Published in Veterinary ophthalmology·2012·Department of Small Animal Medicine, Brazil·View original on PubMed →
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Original publication title: Comparison of intraocular pressure measurements between the Tono-Pen XL® and Perkins® applanation tonometers in dogs and cats.
Plain-English summary
A study looked at how two different devices, the Tono-Pen XL and Perkins tonometers, measure eye pressure in healthy dogs and cats. Both devices were tested on 25 conscious pets using eye drops to numb the area. The results showed that while both devices provided similar average eye pressure readings, the Tono-Pen XL tended to show slightly higher maximum values compared to the Perkins. This means that while both tools are effective, they might give different readings under certain conditions, so it's important for vets to know which device was used when interpreting results.
People also search for: dog eye pressure measurement · cat eye problems · Tono-Pen XL vs Perkins tonometer · how to check dog eye pressure · cat eye pressure test
Abstract
OBJECTIVE: To compare the accuracy between two applanation tonometers, Tono-Pen XL(®) and Perkins(®), in ophthalmoscopically normal dogs and cats. ANIMALS: Both eyes of 25 conscious and healthy dogs and cats were evaluated. Both eyes of five dogs and cats immediately after sacrifice were used as controls for the postmortem study. PROCEDURE: In conscious animals, the tonometry was performed with topical anesthesia using 0.5% proxymetacaine eye drops for both tonometers and 1% fluorescein eye drops for the Perkins tonometer. Readings of intraocular pressure (IOP) in the postmortem study were taken using manometry and tonometry by Tono-Pen XL(®) and Perkins(®). RESULTS: The correlation coefficient (r(2) ) in dogs between manometry and applanation tonometers Tono-Pen XL(®) and Perkins(®) were, respectively, 0.896 and 0.981 and in cats were 0.905 and 0.988. The mean IOP values in conscious dogs with Tono-Pen XL(®) and Perkins(®) were, respectively, 17.5 ± 3.7 mmHg (10.0-25.0 mmHg) and 15.3 ± 2.1 mmHg (12.0-19.8 mmHg) and in conscious cats were 16.8 ± 3.6 mmHg (10.5-24.5 mmHg) and 15.5 ± 1.3 mmHg (13.0-18.5 mmHg). CONCLUSION: There was a strong correlation between the IOP values obtained by direct ocular manometry and the Tono-Pen XL(®) and Perkins(®) tonometers in dogs and cats. There was no statistically significant difference between the mean IOP obtained with both tonometers in conscious animals, there was, however, a difference between the minimum and mainly in the maximum values that were on average 5-6 mmHg higher with Tono-Pen XL(®) than those measured with Perkins(®), which justifies a table of normal values differentiated for each tonometer.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/22050624/