Comparison of simultaneous readings of intraocular pressure in rabbits using Perkins handheld, Tono-Pen XL, and TonoVet tonometers

Kalesnykas, Giedrius; Uusitalo, Hannu

doi:10.1007/s00417-006-0470-8

Cited by 32 publications

(47 citation statements)

References 2 publications

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“…The pin’s motion is monitored by a solenoid in the tonometer, which also serves to propel the magnetic pin 14 . Rebound tonometry has been found to provide reliable and accurate IOP measurements in humans, 15,16 dogs, 17–19 horses, 18 rabbits, 20 mice, 21 birds of prey, 22,23 monkeys, 24,25 as well as cats 13 …”

Section: Introductionmentioning

confidence: 99%

Validation of the TonoVet^®rebound tonometer in normal and glaucomatous cats

McLellan

Kemmerling

Kiland

2012

Veterinary Ophthalmology

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Objective To validate intraocular pressure (IOP) readings obtained in cats with the TonoVet® tonometer. Animal Studied IOP readings obtained with the TonoVet® were compared to IOP readings determined by manometry and by the Tono-Pen XL in 1 normal cat and 2 glaucomatous cats. TonoVet® and Tono-Pen XL readings were also compared in a further 6 normal and 9 glaucomatous cats. Procedures The anterior chambers of both eyes of 3 anesthetized cats were cannulated and IOP was varied manometrically, first increasing from 5 to 70 mm Hg in 5 mm Hg increments, then decreasing from 70 to 10 mm Hg in 10 mm Hg decrements. At each point, two observers obtained three readings each from both eyes, with both the TonoVet® and Tono-Pen XL . IOP was measured weekly for 8 weeks with both tonometers in 6 normal and 9 glaucomatous unsedated cats. Data were analyzed by linear regression. Comparisons between tonometers and observers were made by paired student t-test. Results The TonoVet® was significantly more accurate than the Tono-Pen XL (p=0.001), correlating much more strongly with manometric IOP. In the clinical setting, the Tono-Pen XL , underestimated IOP when compared with the TonoVet®. Conclusions Both the TonoVet® and Tono-Pen XL provide reproducible IOP measurements in cats, however the TonoVet® provides readings much closer to the true IOP than the Tono-Pen XL . The TonoVet® is superior in accuracy to the Tono-Pen XL for detection of ocular hypertension and/or glaucoma in cats in a clinical setting.

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Section: Introductionmentioning

confidence: 99%

Validation of the TonoVet^®rebound tonometer in normal and glaucomatous cats

McLellan

Kemmerling

Kiland

2012

Veterinary Ophthalmology

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“…The studies using the Perkins tonometer have been conducted on dogs, cats, and rabbits [1,8,9,12]. However, use of this tonometer has still not been reported in horses, and there has only been one cattle study that used this tonometer [6].…”

Section: Introductionmentioning

confidence: 99%

“…The other compared ability of the the Perkins, Tonopen XL, and Tonovet tonometers to measure IOP. Both studies found that the Perkins tonometer had the highest degree of accuracy [9]. Therefore, the objective of this study was to evaluate and validate the accuracy of the Perkins handheld applanation tonometer for measuring IOP in horses and cattle.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Perkins handheld applanation tonometer in horses and cattle

et al. 2011

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The objective of this study was to evaluate and validate the accuracy of the Perkins handheld applanation tonometer for measuring intraocular pressure (IOP) in horses and cattle. Both eyes of 10 adult horses and cattle were evaluated in a postmortem study. The eyes from 10 clinically normal adult horses and cattle were also examined after bilateral auriculopalpebral nerve block and topical anesthesia for an in vivo study. IOP was measured postmortem using direct manometry (measured with an aneroid manometer) and tonometry (measured with a Perkins handheld applanation tonometer). The correlation coefficients (r2) for the data from the postmortem manometry and Perkins tonometer study were 0.866 for horses and 0.864 for cattle. In the in vivo study, IOP in horses was 25.1 ± 2.9 mmHg (range 19.0~30.0 mmHg) as measured by manometry and 23.4 ± 3.2 mmHg (range 18.6~28.4 mmHg) according to tonometry. In cattle, IOP was found to be 19.7 ± 1.2 mmHg (range 18.0~22.0 mmHg) by manometry and 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) by tonometry. There was a strong correlation between the IOP values obtained by direct ocular manometry and the tonometer in both horses and cattle. Our results demonstrate that the Perkins handheld tonometer could be an additional tool for accurately measuring IOP in equine and bovine eyes.

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“…al., 2008; Iliev et. al., 2006; Kalesnykas and Uusitalo, 2007; Martinez-de-la-Casa et. al., 2006; Poostchi et.…”

Section: Discussionunclassified

“…al., 2005; Leiva et. al., 2006); rabbits (Kalesnykas and Uusitalo, 2007); mice (Kim et. al., 2007); birds of prey (Jeong et.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of rebound tonometry in non-human primates

Elsmo

Kiland

Kaufman

et al. 2011

Experimental Eye Research

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To determine the accuracy and reproducibility of intraocular pressure (IOP) measurements obtained with the TonoVet® rebound tonometer in cynomolgus macaques and to determine the effects of corneal thickness on measurements obtained by the TonoVet®. The anterior chambers of both eyes of anesthetized monkeys were cannulated with branched 23-G needles; one branch was connected to a vertically adjustable reservoir and the other to a pressure transducer. IOP was increased by 5 mmHg increments and then decreased by 10 mmHg decrements. IOP was measured using the TonoVet® at each increment and decrement by 2 independent observers and at every other increment and every decrement by a single observer using 'minified' Goldmann applanation tonometry. Central corneal thickness was measured with a PachPen(TM) ultrasonic pachymeter. TonoVet® readings correlated well with manometric IOP (slope = 0.972, r(2) coefficient = 0.955). No significant differences were observed when comparing eyes or operators; however there was a non-significant trend for TonoVet® readings taken in right eyes to be closer to manometric IOP than those taken in left eyes. The TonoVet® had a non-significant tendency to underestimate manometric IOP. TonoVet® readings obtained during the decremental phase of the experiment were significantly closer (p < 0.004) to manometric IOP than those obtained during the incremental phase. Central corneal thickness significantly increased (p < 0.0001) over the course of the experiment. The TonoVet® rebound tonometer is a reliable and accurate tool for the measurement of IOP in cynomolgus macaques. This tonometer has several advantages, including portability, ease of use, and brief contact with the corneal surface making topical anesthetics unnecessary.

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Comparison of simultaneous readings of intraocular pressure in rabbits using Perkins handheld, Tono-Pen XL, and TonoVet tonometers

Cited by 32 publications

References 2 publications

Validation of the TonoVet^®rebound tonometer in normal and glaucomatous cats

Validation of the TonoVet^®rebound tonometer in normal and glaucomatous cats

Evaluation of the Perkins handheld applanation tonometer in horses and cattle

Evaluation of rebound tonometry in non-human primates

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Comparison of simultaneous readings of intraocular pressure in rabbits using Perkins handheld, Tono-Pen XL, and TonoVet tonometers

Cited by 32 publications

References 2 publications

Validation of the TonoVet®rebound tonometer in normal and glaucomatous cats

Validation of the TonoVet®rebound tonometer in normal and glaucomatous cats

Evaluation of the Perkins handheld applanation tonometer in horses and cattle

Evaluation of rebound tonometry in non-human primates

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Validation of the TonoVet^®rebound tonometer in normal and glaucomatous cats

Validation of the TonoVet^®rebound tonometer in normal and glaucomatous cats