Agreement of rebound tonometer in measuring intraocular pressure with three types of applanation tonometers.
OBJECTIVE
To evaluate the agreement of iCare rebound tonometer in measuring intraocular pressure (IOP) with Goldmann applanation tonometer (GAT), Tonopen XL, and noncontact tonometer, and the influence of the central corneal thickness (CCT) on IOP measurements made with these four tonometers in 45 (12 control and 33 glaucomatous or ocular hypertensive) eyes.


METHODS
Clinically relevant experimental study.


METHODS
Tonometer intermethod agreement was assessed by the Bland-Altman method. The relations of CCT with absolute IOP values and intertonometer differences were analyzed by linear regression.


RESULTS
The mean differences (95% limits of agreement) in IOP readings between iCare and GAT, Tonopen XL, and noncontact tonometer were 1.40 +/- 4.29, 0.00 +/- 4.78, and 2.22 +/- 4.19 mm Hg, respectively. All tonometries had a marked association with CCT. As the CCT got thicker, iCare considerably overestimated GAT and Tonopen XL.


CONCLUSIONS
Although influenced by CCT, iCare agrees well with applanation tonometers.
Nakamura
Makoto
M
Division of Ophthalmology, Department of Organs Therapeutics, Kobe University Graduate School of Medicine, Kobe, Japan.
Darhad
Urtogtah
U
Tatsumi
Yasuko
Y
Fujioka
Miyuki
M
Kusuhara
Azusa
A
Maeda
Hidetaka
H
Negi
Akira
A
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003315:Cornea / Q000473:pathology; D005260:Female; D005901:Glaucoma / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000503:physiopathology; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation / Q000379:methods*