Effect of central corneal thickness on intraocular pressure with the rebound tonometer and the applanation tonometer in normal dogs

Park, Young-Woo; Jeong, Manbok; Kim, Tae Hyun; Ahn, Jaesang; Ahn, Ji Yeon; Park, Shin-Ae; Kim, Se-Eun; Seo, Kangmoon

doi:10.1111/j.1463-5224.2010.00859.x

Cited by 42 publications

(85 citation statements)

References 26 publications

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“…The laser flaremetry results are similar to those found by YOGO et al (2002) andKHRONE et al (1995) for different breeds, as well. The mean intraocular pressure values were within the standard range for the species (BROOKS, 2008;MARTINS et al, 2009;PARK et al, 2011). The IOP values may vary as a result of aging, changes in blood pressure, action of drugs, circadian variations and ocular inflammation (MARTINS et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

Ophthalmic parameters in adult Shih Tzu dogs

et al. 2015

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Ocular surface diseases are often diagnosed in brachycephalic dogs. The ophthalmic parameters of the Shih Tzu dogs are evaluated in this study since this breed is among the most commonly affected by these diseases. In this study, ophthalmic parameters of this breed de 0,490±0,007mm. À flaremetria a "laser",720±0, 16,118±0,460mmHg. As médias e os erros padrão, à ultrassonografia, foram de 20,255±0,134mm para diâmetro axial horizontal; de 6,624±0,031mm, para

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Section: Resultsmentioning

confidence: 99%

Ophthalmic parameters in adult Shih Tzu dogs

et al. 2015

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“…Since corneal edema is generally observed in the acute early stage of glaucoma [3,21,23], corneal thickness may be influenced by the edematous condition of the eye. One report showed that TP and TV detected IOP values were affected by variations in the central corneal thickness in clinically normal dogs [19]. Hence, the difference of IOP readings between the two tonometers might be influenced by different corneal surface conditions related with acute or chronic glaucoma, thereby inducing a different result in the relationship between the two tonometers [19,24].…”

Section: Discussionmentioning

confidence: 99%

“…One report showed that TP and TV detected IOP values were affected by variations in the central corneal thickness in clinically normal dogs [19]. Hence, the difference of IOP readings between the two tonometers might be influenced by different corneal surface conditions related with acute or chronic glaucoma, thereby inducing a different result in the relationship between the two tonometers [19,24]. In addition, we evaluated only hypertensive glaucomatous eyes for analysis of the regression equation and the correlation coefficient between TP and TV, whereas normotensive eyes were included in the same analysis in the previous study [7].…”

Section: Discussionmentioning

confidence: 99%

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In Vitro and In Vivo Comparison of Applanation Tonometry and Rebound Tonometry in Dogs

Nagata

Yuki

Hasegawa

2011

The Journal of Veterinary Medical Science

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ABSTRACT. Intraocular pressure (IOP) evaluated by applanation tonometry via TONO-PEN XL (TP), and rebound tonometry via TonoVet (TV) were compared in enucleated canine eyes with varied pressure of the anterior chamber (AC) and in clinical cases. TV measured IOP values were lower than IOP measurements of TP in the enucleated eyes with 5-10 mmHg of AC (P<0.0001), though there was no significant difference in IOP values obtained with TP and TV on the pressure ranges of 15-20 mmHg. However, TP detected IOP values were lower than IOP measurements of TV in the eyes with over 25 mmHg of AC (P<0.0001). The results of clinical cases were similar to the enucleated eye model. There was no significant difference in IOP values obtained from TP and TV in dogs with normotensive eyes. IOP measurements of TP were lower than those of TV in glaucomatous eyes (P<0.0001). TV was a reliable tonometer for measurement of IOP in hypertensive eyes, whereas it was less accurate than TP in hypotensive eyes. The characteristics of TP and TV should be considered in the evaluation of IOP in practice.KEY WORDS: canine, intraocular pressure, TONO-PEN applanation tonometry, TonoVet rebound tonometry.J. Vet. Med. Sci. 73(12): 1585-1589, 2011 Evaluation of intraocular pressure (IOP) is important for the diagnosis and management of ophthalmic disease in animals [14]. Several tonometries, including indentation, applanation, or rebound tonometry are used to measure IOP in veterinary field [14]. Applanation tonometry, such as TONO-PEN XL (TP), is widely used in the field of veterinary ophthalmology, though it includes potential problems with inaccuracies caused by manual measurement and requires application of a topical anesthetic before IOP measurement [18]. On the other hand, rebound tonometry, such as TonoVet (TV), which has recently become available, is expected to be more reliable than TP, because a constant pressure can be given to the cornea by a mechanically launched probe, thereby providing increased accuracy of IOP measurements [7,10,12]. An added benefit is that topical anesthetics are not needed for detection of the animal's IOP [7,10,12]. There are reports dealing with the usefulness and/or accuracy of TV in animals and birds [1,6,7,[9][10][11][12]. In dogs, TP displayed lower IOP values than TV in in vitro enucleated eyes, although the relation between the two tonometries in glaucomatous eyes was not the same as in vitro [7]. Information about the relationship of IOP evaluated by TP and TV is essential for veterinary practitioners, since the number of veterinary ophthalmologists using both TP and TV has increased recently to assure accurate diagnoses of animals with ophthalmic diseases. The aim of this study is to re-evaluate IOP values measured with TP and TV in the enucleated canine eye model and clinical cases, and to clarify the relationship and characteristics of both tonometries in veterinary practice. MATERIALS AND METHODS Eye samples and clinical cases:Thirty eyes without ophthalmic disorders were immediately enucleated transconj...

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“…One study demonstrated that for every 100µm increase in central corneal thickness in normal dogs there was an elevation of 1mmHg in IOP using applanation tonometry (Park et al 2011). However, another study demonstrated that central corneal thickness did not affect applanation tonometry (Kato 2014).…”

Section: Discussionmentioning

confidence: 99%

Design of an intraocular pressure curve protocol for use in dogs

Sanchez

Silva

Dawson

2016

J of Small Animal Practice

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Summary:Objectives:To establish an intraocular pressure curve protocol that is safe for corneal health and determining if they detect harmful elevations of intraocular pressure outside normal clinic hours. To determine inter-user variability and if repeated measurements affect intraocular pressures.Methods: Dogs with glaucoma were included in the first part of the study in which intraocular pressures were measured using three protocols. Protocol 1 used applanation tonometry every two hours over 24h. Protocols 2 and 3 used applanation or rebound tonometry, respectively, and measured intraocular pressures every three hours over 30h. Sixty additional intraocular pressure curves from dogs with glaucoma and 20 from healthy dogs were then analysed for inter-user variability. Results:128 Intraocular pressure curves were determined in 30 dogs. Protocol 1 resulted in one ulcer in five pressure curve measurements, Protocol 2 in one ulcer in 62 pressure curves, and Protocol 3 in no ulcers in 61. Elevated intraocular pressures were detected on 61 occasions, of which 26 developed outside normal clinic hours. Sixty-one additional intraocular pressure curves revealed that repeated measurements had no effect on intraocular pressure. Assessors had a significant variability in righteye but not left-eye readings.Conclusions: Protocol 3, using rebound tonometry every three hours for 30hr is safe and identified elevated intraocular pressures outside normal clinic hours in 12/30 (40%) of patients that single intraocular pressure measurement during consultation hours would not have identified. Intraocular pressure curves may be recommended for clinical practice and glaucoma studies.

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Effect of central corneal thickness on intraocular pressure with the rebound tonometer and the applanation tonometer in normal dogs

Abstract: 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.

Cited by 42 publications

References 26 publications

Ophthalmic parameters in adult Shih Tzu dogs

Ophthalmic parameters in adult Shih Tzu dogs

In Vitro and In Vivo Comparison of Applanation Tonometry and Rebound Tonometry in Dogs

Design of an intraocular pressure curve protocol for use in dogs

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