Rebound tonometry is a great alternative to the Goldmann applanation tonometer in both screening and follow-up of glaucoma patients. It is a very reliable technology with a wide range of clinical applications and its use has become widespread in our practices.
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In our study, the Icare ic200 overestimated the IOP. The overestimation increased as the baseline IOP increased. The agreement between the IOP measurement by GAT and Icare ic200 was <2 mm Hg at all ranges of IOP. The narrow limits of agreement between the tonometers for an IOP <21 mm Hg makes it a useful alternative to GAT in this pressure range.
There was excellent agreement between the IC200 and GAT tonometers, both in healthy subjects and PCG, with a trend to overestimate IOP when measured with IC200. There was no influence by CCT on IOP measurements in patients with PGC.