Premium
Measurement of the difference in intraocular pressure between the sitting and lying body positions in healthy subjects: direct comparison of the I care P ro with the G oldmann applanation tonometer, P neumatonometer and T onopen XL
Author(s) -
Barkana Yaniv,
Gutfreund Shay
Publication year - 2014
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1111/ceo.12272
Subject(s) - medicine , intraocular pressure , supine position , sitting , ophthalmology , body position , anesthesia , physical medicine and rehabilitation , pathology
Background Change in intraocular pressure is known to occur with body posture. Previously, markedly different estimations of this change were reported. The I care P ro ( I care; T iolat O y, H elsinki, F inland) is designed to measure intraocular pressure with the subject supine. We compared the measurement of postural change in intraocular pressure obtained with this and 3 other tonometers: G oldmann applanation tonometer ( CSO , F irenze, I taly), P neumatonometer ( M odel 30, R eichert, D epew, NY , USA ) and the T onopen XL ( R eichert). Design Prospective comparative study. Participants Twenty‐one healthy subjects. Methods Intraocular pressure was measured in random order with four tonometers, first sitting then after 10 min of lying. Main Outcome Measures Average postural intraocular pressure change (mm H g) and the 95% limits of agreement for measuring postural intraocular pressure change between tonometers.Results Average postural intraocular pressure change (lying minus sitting, mm H g) was measured highest with the G oldmann applanation tonometer (4.1 ± 2.6) and Pneumatonometer (3.9 ± 2.1), significantly lower with the T onopen (0.9 ± 1.7) and was negative with the I care (−0.9 ± 3.3). The 95% limits of agreement for measuring postural intraocular pressure change between G oldmann applanation tonometer and I care, Pneumatonometer and T onopen were −3.2–13.3, −6.4–6.9 and −2.8–9.4 mmHg, respectively. Conclusions Postural change in intraocular pressure was measured similarly, on average, with G oldmann applanation tonometer and Pneumatonometer, and much lower with T onopen and I care P ro. There was poor interdevice agreement in measuring this parameter. We observed high intersubject variability, suggesting the clinical importance of this measurement in the diagnosis and management of glaucoma.