Mathematical Discrepancies of the Tono-Pen Applanation Tonometer

PURPOSE OF THE STUDY:The purpose of the study was to determine if Tono-Pen tonometers use simple average and coefficient of variation (CV) algorithms to calculate intraocular pressure (IOP). MATERIAL AND METHODS:IOPs were measured as part of routine ocular examination in 152 client-owned dogs. Using...

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Veröffentlicht in:	Journal of glaucoma 2017-02, Vol.26 (2), p.e30-e36
Hauptverfasser:	Doering, Clinton J, Feldman, Eugenia, Bdolah-Abram, Tali, Merideth, Reuben E, Ofri, Ron
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Animals Dogs Female Intraocular Pressure - physiology Male Ocular Hypertension - diagnosis Ocular Hypertension - veterinary Predictive Value of Tests Reproducibility of Results ROC Curve Statistics as Topic - standards Tonometry, Ocular - standards Tonometry, Ocular - veterinary
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Zusammenfassung:	PURPOSE OF THE STUDY:The purpose of the study was to determine if Tono-Pen tonometers use simple average and coefficient of variation (CV) algorithms to calculate intraocular pressure (IOP). MATERIAL AND METHODS:IOPs were measured as part of routine ocular examination in 152 client-owned dogs. Using 11 Tono-Pen’s, a total of 778 averaged readings were collected. Individual IOP readings, and average IOP and CV displayed by the instrument, were recorded. Average IOP and CV were then manually calculated from individual readings and compared with those displayed by the instrument. RESULTS:The mean absolute difference between the calculated and displayed average IOP was 1.37±2.01 mm Hg (P20%, but displayed CV was
ISSN:	1057-0829 1536-481X
DOI:	10.1097/IJG.0000000000000524