Peer-reviewed veterinary case report
How cornea thickness affects eye pressure readings in normal dogs
By Park, Young-Woo et al.·Published in Veterinary ophthalmology·2011·Department of Veterinary Surgery and Ophthalmology, South Korea·View original on PubMed →
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Original publication title: Effect of central corneal thickness on intraocular pressure with the rebound tonometer and the applanation tonometer in normal dogs.
- Species:
- dog
Plain-English summary
A study involving 60 healthy Beagle dogs looked at how the thickness of the cornea affects eye pressure readings taken with two different devices: the TonoVet and the TonoPen XL. The results showed that the TonoVet recorded higher eye pressure compared to the TonoPen XL. Additionally, it was found that thicker corneas led to higher eye pressure readings, with an increase of about 1 to 2 mmHg for every 100 micrometers of corneal thickness. This means that when your vet measures your dog's eye pressure, they should also consider how thick your dog's cornea is for accurate results.
People also search for: dog eye pressure measurement · Beagle corneal thickness · TonoVet vs TonoPen eye test
Abstract
OBJECTIVE: To evaluate the effect of central corneal thickness (CCT) on the measurement of intraocular pressure (IOP) with the rebound (TonoVet(®)) and applanation (TonoPen XL(®)) tonometers in beagle dogs. ANIMAL STUDIED: Both eyes of 60 clinically normal dogs were used. PROCEDURES: The IOP was measured by the TonoVet(®), followed by the TonoPen XL(®) in half of the dogs, while the other half was measured in the reverse order. All CCT measurements were performed 10 min after the use of the second tonometer. RESULTS: The mean IOP value measured by the TonoVet(®) (16.9 ± 3.7 mmHg) was significantly higher than the TonoPen XL(®) (11.6 ± 2.7 mmHg; P < 0.001). The IOP values obtained by both tonometers were correlated in the regression analysis (γ(2) = 0.4393, P < 0.001). Bland-Altman analysis showed that the lower and upper limits of agreement between the two devices were -0.1 and +10.8 mmHg, respectively. The mean CCT was 549.7 ± 51.0 μm. There was a correlation between the IOP values obtained by the two tonometers and CCT readings in the regression analysis (TonoVet(®) : P = 0.002, TonoPen XL(®) : P = 0.035). The regression equation demonstrated that for every 100 μm increase in CCT, there was an elevation of 1 and 2 mmHg in IOP measured by the TonoPen XL(®) and TonoVet(®), respectively. CONCLUSIONS: The IOP obtained by the TonoVet(®) and TonoPen XL(®) would be affected by variations in the CCT. Therefore, the CCT should be considered when interpreting IOP values measured by tonometers in dogs.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/21521440/