Evaluation of the effect of disposable tonometer cover brand on performance of Tono-Pen Vet in canine eyes

Vet Ophthalmol. 2021 Mar;24 Suppl 1(Suppl 1):194-198. doi: 10.1111/vop.12877. Epub 2021 Feb 27.

ABSTRACT

PRIMARY OBJECTIVE: To evaluate the effect of latex tip cover manufacturer on accuracy and repeatability of Tono-Pen Vet™ in canine eyes.

ANIMAL STUDIED: Twelve enucleated globes from six dogs.

PROCEDURES: The anterior chamber was cannulated and connected to a calibrated manometer. Intraocular pressure (IOP) measurements were obtained using the Tono-Pen Vet and TONOVET Plus at manometric IOP ranging from 5 to 80 mmHg. At each IOP, the Tono-Pen Vet was used with a new Ocu-Film™ latex tip cover (the only manufacturer-approved brand of cover) followed by a new Softips™ latex tip cover. For comparison, the TONOVET Plus was also used at each IOP with a new disposable rebound probe. Measured IOP values were analyzed by linear regression and intraclass correlation coefficient (ICC).

RESULTS: Tono-Pen Vet accuracy was unaffected by tip cover manufacturer or by frequent change in cover. Using ICC analysis, repeatability of measurements using either tonometer was good to excellent at physiologic IOP levels but variably decreased with both devices at supraphysiologic IOP.

CONCLUSIONS: Neither tip cover manufacturer nor frequent changes in tip cover adversely affect Tono-Pen Vet accuracy. Measurement repeatability with Tono-Pen Vet and TONOVET Plus is widely variable at supraphysiologic IOP. Therefore, minor changes in IOP >25 mmHg should not be used to make clinical decisions without considering this variability.

PMID:33638927 | PMC:PMC9710742 | DOI:10.1111/vop.12877

Description

CONCLUSIONS: Neither tip cover manufacturer nor frequent changes in tip cover adversely affect Tono-Pen Vet accuracy. Measurement repeatability with Tono-Pen Vet and TONOVET Plus is widely variable at supraphysiologic IOP. Therefore, minor changes in IOP >25 mmHg should not be used to make clinical decisions without considering this variability.

pubmed:33638927
https://pubmed.ncbi.nlm.nih.gov/33638927/?utm_source=curl&utm_medium=rss&utm_campaign=None&utm_content=1riwIKvlTlJkFrGpq1NiIjJGRLkvdE5A3yNeCAeKnf9PEXNcw1&fc=None&ff=20240215125000&v=2.18.0
Published Date
2021-02-27
Associated Team Member
Vet Ophthalmol
<div><p style="color: #4aa564;">Vet Ophthalmol. 2021 Mar;24 Suppl 1(Suppl 1):194-198. doi: 10.1111/vop.12877. Epub 2021 Feb 27.</p><p><b>ABSTRACT</b></p><p xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:p1="http://pubmed.gov/pub-one">PRIMARY OBJECTIVE: To evaluate the effect of latex tip cover manufacturer on accuracy and repeatability of Tono-Pen Vet™ in canine eyes.</p><p xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:p1="http://pubmed.gov/pub-one">ANIMAL STUDIED: Twelve enucleated globes from six dogs.</p><p xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:p1="http://pubmed.gov/pub-one">PROCEDURES: The anterior chamber was cannulated and connected to a calibrated manometer. Intraocular pressure (IOP) measurements were obtained using the Tono-Pen Vet and TONOVET Plus at manometric IOP ranging from 5 to 80 mmHg. At each IOP, the Tono-Pen Vet was used with a new Ocu-Film™ latex tip cover (the only manufacturer-approved brand of cover) followed by a new Softips™ latex tip cover. For comparison, the TONOVET Plus was also used at each IOP with a new disposable rebound probe. Measured IOP values were analyzed by linear regression and intraclass correlation coefficient (ICC).</p><p xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:p1="http://pubmed.gov/pub-one">RESULTS: Tono-Pen Vet accuracy was unaffected by tip cover manufacturer or by frequent change in cover. Using ICC analysis, repeatability of measurements using either tonometer was good to excellent at physiologic IOP levels but variably decreased with both devices at supraphysiologic IOP.</p><p xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:p1="http://pubmed.gov/pub-one">CONCLUSIONS: Neither tip cover manufacturer nor frequent changes in tip cover adversely affect Tono-Pen Vet accuracy. Measurement repeatability with Tono-Pen Vet and TONOVET Plus is widely variable at supraphysiologic IOP. Therefore, minor changes in IOP &gt;25 mmHg should not be used to make clinical decisions without considering this variability.</p><p style="color: lightgray">PMID:<a href="https://pubmed.ncbi.nlm.nih.gov/33638927/?utm_source=curl&utm_medium=rss&utm_content=1riwIKvlTlJkFrGpq1NiIjJGRLkvdE5A3yNeCAeKnf9PEXNcw1&ff=20240215125000&v=2.18.0">33638927</a> | PMC:<a href="https://www.ncbi.nlm.nih.gov/pmc/PMC9710742/?utm_source=curl&utm_medium=rss&utm_content=1riwIKvlTlJkFrGpq1NiIjJGRLkvdE5A3yNeCAeKnf9PEXNcw1&ff=20240215125000&v=2.18.0">PMC9710742</a> | DOI:<a href=https://doi.org/10.1111/vop.12877>10.1111/vop.12877</a></p></div>
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24 Suppl 1(Suppl 1):194-198
2021
02
Vanessa Y Yang, J Seth Eaton, Scott J Hetzel, Paul E Miller
Investigation Type
Development Phase