Peer-reviewed veterinary case report
Comparing two eye pressure tests in dogs with and without eye disease
By Michaud, Bertrand & Lesne, Fabien·Published in The Veterinary record·2024·Ophthalmology Service, France·View original on PubMed →
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Original publication title: Comparing the intraocular pressure values obtained with a rebound tonometer (TONOVET Plus) and an indentation tonometer (IOPvet) in dogs with and without ocular disease.
- Species:
- dog
Plain-English summary
A group of dogs with and without eye problems had their eye pressure measured using two different devices: a rebound tonometer and an indentation tonometer. The study found that the indentation tonometer was safe and easy to use, and it accurately identified normal eye pressure in most cases. However, it struggled to detect higher eye pressures, which could lead to missed diagnoses of serious conditions. Overall, while the indentation tonometer can be useful, the rebound tonometer is still the more reliable option for checking eye pressure in dogs.
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Abstract
BACKGROUND: This study aimed to compare the intraocular pressure (IOP) values obtained from two groups of dogs using the IOPvet indentation tonometer to those obtained from the same dogs using an established rebound tonometer (TONOVET Plus). METHODS: Tonometry was performed on 36 dogs with ocular diseases (70 eyes; group A) and 25 healthy dogs (49 eyes; group B). First, the TONOVET Plus rebound tonometer was used. Then, one drop of oxybuprocaine hydrochloride was applied to each eye, and 1 minute later, the IOP was estimated using the IOPvet. RESULTS: The IOPvet was safe, well tolerated and easy to use. The instrument had a high specificity (98.5%) for identifying IOPs of 20 mmHg or less. A lack of sensitivity (67.9%) was noted when evaluating eyes with an IOP between 20 and 30 mmHg. The sensitivity (33.3%) for identifying canine eyes with an IOP of greater than 30 mmHg (n = 24) was low. LIMITATIONS: This study lacks manometric work, which would be hard to justify with client-owned dogs. Quantitative numerical data were compared with qualitative values and the same investigator obtained readings using both tonometers without being masked. CONCLUSIONS: The IOPvet is highly sensitive for assessing normal IOPs, but underestimation of higher IOPs can lead to poor diagnostics. Digital tonometers remain the best way to assess IOP in veterinary clinics.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/38845173/