Comparison of intraocular pressure in healthy brachycephalic and nonbrachycephalic cats using the Icare® TONOVET Plus rebound tonometer

Abstract

Objective To compare intraocular pressure using the Icare® TONOVET Plus rebound tonometer in healthy brachycephalic and nonbrachycephalic cats. Animals studied Both eyes of 78 healthy cats were investigated in this study. Cats were divided into two groups: brachycephalic (n = 39) and nonbrachycephalic (n = 39). Procedures Nose position and muzzle ratio were photographically recorded and analyzed. Physical and ophthalmic examinations were performed. Intraocular pressure was measured using the Icare® TONOVET Plus rebound tonometry instrument. Quantitative mean values were statistically compared using an unpaired t‐test at a significance level of p < .05. Results Mean values of the nose position and muzzle ratio were significantly lower in the brachycephalic group (20.14 ± 5.43%, 9.61 ± 3.29%) compared with the nonbrachycephalic group (29.21 ± 4.30%, 13.97 ± 6.01%). The mean intraocular pressure for brachycephalic cats (15.76 ± 0.50 mmHg) was significantly lower (p < .001) than for nonbrachycephalic cats (18.77 ± 0.49 mmHg). Conclusions Intraocular pressure was significantly lower in brachycephalic cats using the Icare® TONOVET Plus rebound tonometer. Intraocular pressure values obtained in this study could be used as a guideline for measurements obtained using this tonometry device in healthy brachycephalic and nonbrachycephalic cats.

Ocular surface physiology and aqueous tear secretion in cats of diverse cephalic conformations

“…Average blink rate varied between 4.1 and 6.5 blinks/min, with no statistical differences detected among breeds ( p = .094). Intraocular pressure (IOP) was significantly different among breeds ( p < .001) but remained within the normal range for the species, 24 being significantly lower in Devon Rex cats when compared to British Shorthair ( p = .004), Burmese ( p = .009), or Scottish Fold ( p < .001) cats. Corneal sensitivity did not differ significantly among breeds ( p = .152).…”

Effects of intramuscular alfaxalone and dexmedetomidine alone and combined on ocular, electroretinographic, and cardiorespiratory parameters in normal cats

“…It provides an invaluable mean of assessing retinal function with opaque media or during the early phases of diseases without significant funduscopic changes ( 2 ). Glaucoma is an ocular disorder characterized by increased intraocular pressure (IOP), and the rebound tonometry is a widely used method of IOP measurement ( 3 ). Aqueous tear deficiency (dry eye) can lead to serious ocular complications, and Schirmer tear test-1 (STT-1) examination is commonly used in clinical practice ( 4 ).…”

Comparison of theTONOVETPlus®, TonoVet®, and Tono‐Pen Vet™ tonometers in normal cats and cats with glaucoma

“…In a previous study by Kerdchuchuen et al, the TVP was used to compare IOP values between healthy brachycephalic and non‐brachycephalic cats. However, that study only assessed IOP differences between each group of cats and did not validate the TVP against manometry or against other tonometer models 36 . To our knowledge, there have been no prior published studies validating use of the TVP in cats, relative to the gold standard of manometry.…”