Comparison of Intraocular Pressure and PachymeterMeasurements Obtained by Non Contact Tonometerpachymeterwith Goldmann Applanation Tonometer andCorneal Topography

Purpose: To compare the measurements of intraocular pressure (IOP) and central corneal thickness (CCT) by tono-pachymeter (CT-1P) with\rIOP measurements by Goldmann applanation tonometer (GAT), and CCT measurements by Pentacam.\rMaterials and Methods: Two hundred eighteen eyes of 109 patients were included in the study. Intraocular pressure measurements were\robtained by the CT-1P and GAT, whereas CCT measurements were obtained by CT-1P and Pentacam. Blant-Altman plots for agreement, and\rPearson correlation and interclass correlation (ICC) for reliability between the measurements were analyzed.\rResults: The mean IOPCT-1P, IOPCT-1P adj., IOPGAT were measured as 18.2±4.32 mmHg, 17.75±4.05 mmHg and 16.9±4.16 mmHg, respectively.\rThe mean CCT was measured as 554.8±37.3 ?m and 543.6±35.9 ?m with CT-1P and Pentacam, respectively. Mean differences between\rdevices were signifi cantly different in terms of IOP and CCT measurement (p<0.001, for all). Interclass correlation coeffi cient confi rmed the\rexcellent reliability between devices in terms of measurement of IOP and CCT (p<0.001, for all). The 95% limits of agreement (LoA) for IOP\rwere -4.24 to 3.28 mmHg between IOPCT-1P adj. and IOPCT-1P, -3.49 to 5.14 mmHg between IOPCT-1P adj. and IOPGAT and -2.7 to 5.3 mmHg between\rIOPCT-1P and IOPGAT. Also 95% LoA for CCT were -12.33 to 32.16 ?m between CCTCT-1P and CCTPentacam.\rConclusion: Although CT-1P overestimated both IOP and CCT measurements, the device had an excellent ICC with Pentacam and GAT in\rterms of CCT and IOP measurements. The ability of tono-pachymeters measuring both CCT and IOP with a single device provide an important\rconvenience in busy clinics.