The inclusion criterion was consecutive patients who attended routine clinical appointments during the study period. The study was performed according to the World Medical Association Declaration of Helsinki, at 2 ophthalmology centers in Tasmania, Australia. The University of Tasmania Human Research Ethics Committee provided ethical approval for the research (reference: H18061). The study’s aim was to compare, in a clinical audit of 1,000 eyes, the IOP measured by Icare ic100 RT with the IOP measured by GAT. As Icare rebound tonometry is widely used as a screening tool in IOP measurement, we set out to examine this method compared to GAT. įew studies have been published comparing the performance of Icare ic100 tonometer against GAT. Studies have also reported no significant differences in mean IOP measured by Icare compared to GAT. Other studies found Icare overestimates IOPs when compared to GAT. Some studies reported undermeasurement of IOP by the Icare in comparison to GAT. Results of these studies have been inconsistent. Among these, Goldmann applanation tonometry (GAT) is still considered the gold standard for IOP measurement.Ī number of studies have compared the accuracy of different tonometers, in particular between the GAT and versions of the Icare RT such as the Icare TAOi and the Icare Pro. Since then, many devices have been developed to measure IOP, including the Maklakoff tonometer, the Goldmann tonometer, the Perkins tonometer, rebound tonometers (RTs), and noncontact tonometers. IOP was first measured in 1865, when Von Graefe developed the first tonometry instrument. Measurement of intraocular pressure (IOP) forms a crucial component in the diagnosis and management of multiple ocular conditions, especially glaucoma. The mean difference of 4.2 mm Hg can have significant clinical implications, particularly in the management of glaucoma patients. Conclusions: The Icare tonometer consistently under estimated IOP compared to GAT, irrespective of CCT ranges and other subgroup analyses. 25.2 mm Hg, p < 0.0001) and within each subanalysis. Mean ic100 IOPs were also significantly lower than mean GAT IOPs within each IOP strata ≤12 (7.9 vs. Mean IOP was significantly lower when measured by ic100 than by GAT (12.1 vs. Results: There was moderate agreement between ic100 and GAT IOP measurements (intraclass correlation coefficient 0.73). IOP measurements were investigated in all eyes, by IOP substrata, by CCT group, by number of topical glaucoma medications, and diagnosis. Central corneal thickness (CCT) was measured using a hand-held pachymeter. Methods: This cross-sectional study measured IOP in 1,000 eyes (500 left and 500 right) using the Icare ic100 and GAT. Objectives: The objective was to compare the IOP measured using Icare ic100 and GAT. Many devices have been developed to measure IOP with Goldmann applanation tonometry (GAT) considered the gold standard for IOP measurement. Background: Measurement of intraocular pressure (IOP) forms a crucial component in the diagnosis and management of glaucoma.
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