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Comparison of intraocular pressure measured by non-contact tonometer, Goldmann applanation tonometer, rebound tonometer and Corvis ST tonometer and clinical usefulness of Corvis ST tonometer in patients with glaucoma

Poster Details

First Author: S.Ha SOUTH KOREA

Co Author(s):    J. Han                    

Abstract Details


Purpose: To compare the accuracy and agreement of Intraocular pressure(IOP) and Central corneal thickness(CCT) measurements with noncontact tonometer Corvis Scheimpflug Technology(Corvis ST) Versus Non-contact tonometer(NCT), Goldmann Applanation Tonometer(GAT) , Rebound tonometer(RBT) and ultrasound-based corneal pachymetry(US-CCT).


To evaluate the corneal biomechanics values by Corvis ST Tonometer in patients with Glaucoma.


31 healthy participants, 47 patients with Primary open angle glaucoma(POAG) and Normal tension glaucoma(NTG) were enrolled in this study. One eye was selected randomly. In each participant, GAT, NCT, RBT, US-CCT and measurements with Corvis ST(Corvis-IOP and Corvis-CCT) were obtained. IOP and CCT measurements of each devices were compared . Device agreement was calculated by Bland-Altman analysis . And corneal highest concavity parameters were compared between healthy subjects and glaucoma patients.


Mean IOP for all examined eyes was 13.28±2.32 mmHg for CST, 14.10±3.11 mmHg for GAT, 14.44±3.10 mmHg for NCT, 13.73±2.90mmHg for RBT. There was no statistically difference in IOP measurements among tonometers. Correlation analysis showed a high correlation between each pair of tonometers (all P < 0.0001). Bland-Altman plots of all included devices revealed good agreement of the IOP and CCT measurement . In glaucoma patients, Highest concavity time and peak distance of highest concavity parameters was statistically decreased than normal subjects. (16.93±0.66ms vs 16.48±0.84mm p=0.020 , 4.23± 1.34mm vs 3.41±1.27mm p=0.017, respectively)


The CST, a newly developed tonometer with features of visualization and measurement of the corneal deformation response to an air impulse, could be considered as a reliable alternative method for measuring IOP and CCT in healthy subjects and glaucoma patients. Highest concavity parameters might be another important indicators in identifying corneal viscosity or elasticity in patients with glaucoma.

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