[I have tested for you. The contour tonometer. IOP analysis using "Dynamic Contour Tonometry"]

The Pascal tonometer, or the Dynamic Contour Tonometer (DCT) (Swiss Microtechnology, Zurich) is a device that differs from the Goldmann applanation tonometer (GAT) in its IOP sensor at the center of the cone that measures pressure by a means less dependent on corneal structure. The efficacy of this device in measuring IOP after LASIK surgery has been demonstrated. It can be used to obtain more precise IOP measurements in glaucoma patients or ocular hypertension in cases where the measurement is debatable because of a very thin or very thick cornea. We studied the relations between the measurements with the two devices on thin, normal, and thick corneas. The Pascal tonometer generally showed a good correlation with the Goldmann applanation tonometer, but the limits of agreement are wide. For thin corneas, this device seems more reliable than the GAT, but for thick corneas, no difference was found between the two methods.