Comparison of Disposable Goldmann Applanation Tonometer, ICare ic100, and Tonopen XL to Standards of Care Goldmann Nondisposable Applanation Tonometer for Measuring Intraocular Pressure.
Summary
The most reliable modality, with good correlation with the Goldmann tonometer values, was the GAT with dGAT, followed in descending order by the Tonopen XL and ICare.
Abstract
PURPOSE
To compare intraocular pressure (IOP) measurements by Goldmann applanation tonometer (GAT), disposable Goldmann applanation prism, ICare, and Tonopen.
MATERIALS AND METHODS
A total of 74 patients with varying glaucoma status were examined in our outpatient clinic and IOP was measured with 3 tonometers. The disposable Tonojet prism (dGAT), Tonopen XL, and ICare ic100 were compared with the GAT.
RESULTS
There were good intraclass correlation coefficients between IOP measurements by GAT and dGAT (0.95), Tonopen (0.83), and ICare (0.77), all P24 mm Hg). These disposable modalities should be avoided in extreme IOP ranges outside the normal range.
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Discussion
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