Inter‐user and intra‐user variation of two tonometers in horses

Background It is currently unknown which of the two devices most commonly used in equine ophthalmology for intraocular pressure (IOP) estimation demonstrates the lowest inter‐user and intra‐user variation. Objectives To assess the inter‐user and intra‐user variation of two tonometers in sedated and...

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Bibliographic Details
Published in:Equine veterinary journal 2020-07, Vol.52 (4), p.572-576
Main Authors: Lewin, Andrew C., Liu, Chin‐Chi, Camacho‐Luna, Pilar, Alling, Christopher, Carter, Renee T.
Format: Article
Language:English
Subjects:
Anesthesia - veterinary
Animals
horse
Horses
Intraocular Pressure
Reproducibility of Results
tonometer
Tonometry, Ocular
TonoPen
TonoVet
variability
variation
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Summary:Background It is currently unknown which of the two devices most commonly used in equine ophthalmology for intraocular pressure (IOP) estimation demonstrates the lowest inter‐user and intra‐user variation. Objectives To assess the inter‐user and intra‐user variation of two tonometers in sedated and unsedated horses. Study design Randomised masked cross‐over trial. Methods Four examiners used the rebound (ICare® TonoVet) and applanation (TonoPen®) tonometers to measure the intraocular pressure (IOP) in triplicate in 10 normal horses before and after sedation with xylazine. For inter‐user variation, coefficient of variation (CV) values were calculated from the mean of each examiner for each condition combination. For intra‐user variation, CV values were calculated from the individual measurements of each examiner for each condition combination. CV values were also assessed in relation to other variables using ANOVA. Results The rebound tonometer was found to have lower inter‐user (15.4% vs 21.7%, P = .01) and intra‐user (9.1% vs 16.1%, P 
ISSN:0425-1644
2042-3306
DOI:10.1111/evj.13208