Peer-reviewed veterinary case report
Eye pressure tests compared in normal and glaucoma cats
By Kiland, Julie A et al.·Published in Veterinary ophthalmology·2023·Department of Ophthalmology and Visual Sciences, United States·View original on PubMed →
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Original publication title: Comparison of the TONOVET Plus®, TonoVet®, and Tono-Pen Vet™ tonometers in normal cats and cats with glaucoma.
- Species:
- cat
Plain-English summary
A group of cats, including both healthy ones and those with glaucoma, had their eye pressure measured using three different devices. The new TONOVET Plus (TVP) and the original TONOVET gave similar and accurate readings, while the Tono-Pen Vet significantly underestimated eye pressure, especially in cats with glaucoma. This means that if your cat has high eye pressure, the Tono-Pen might not give you the right information. For the best results, the TVP or original TONOVET are recommended for checking eye pressure in cats.
Abstract
OBJECTIVES: To determine the accuracy, precision, and clinical applicability of the ICare® TONOVET Plus (TVP) in cats. ANIMALS AND PROCEDURES: IOP readings obtained with the TVP were compared to values obtained concurrently with the original TONOVET (TV01) and Tono-Pen Vet™ (TP) in 12 normal cats (24 eyes) and 8 glaucomatous LTBP2-mutant cats (13 eyes) in vivo. Reproducibility of TVP readings was also assessed for three observers in the above cats. The anterior chambers of five different normal cat eyes were cannulated ex vivo. IOP was measured with the TVP, TV01, and TP at manometric IOPs ranging from 5 to 70 mmHg. Data were analyzed by linear regression, ANOVA and Bland-Altman plots. ANOVA was used to assess reproducibility of TVP readings obtained by different observers and an ANCOVA model controlled for variation of individual cats. p < .05 was considered significant. RESULTS: TVP values strongly correlated with TV01 values (y = 1.045x + 1.443, R = .9667). The TP significantly underestimated IOP relative to the TVP and TV01, particularly at high IOP. IOP values obtained by 1 observer were significantly higher (~1 mmHg average) compared to the other 2 observers via ANCOVA analysis (p = .0006479 and p = .0203). Relative to manometry, the TVP and TV01 were significantly more accurate (p < .0001) and precise (p < .0070) than the TP in ex vivo eyes. CONCLUSIONS: IOP readings obtained with the TVP and TV01 are broadly interchangeable between models and between observers, but subtle differences may be important in a research context. TP readings vastly underestimate high IOP in feline glaucoma.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/37339127/