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Glaucoma screening with a new non-contact air impulse tonometer

Poster Details

First Author: P.Papadopoulos GREECE

Co Author(s):    D. Bessinis   A. Papadopoulos   C. Kakoulidis   A. Cernak     

Abstract Details


To evaluate the accuracy of data provided by Corvis ST (CST), a newly developed tonometer with features of visualization and measurement of the corneal deformation response to an air impulse, for intraocular pressure (IOP) compared to Goldmann tonometer (GAT) and a non-contact tonometer (NCT) as well as central corneal thickness (CCT) compared to U/S pachymetry and Pentacam.


1- Athens Ophthalmo-Check Eye Center 2- Ophthalmology Dept., Slovak Medical University 3- Ophthalmology Dept., Evaggelismos Hospital, Athens


Sixty Seven eyes of 34 patients were examined using the three different methods for IOP and Central Corneal Thickness (CCT). Statistical analysis was performed with Bland-Altman plot.


NCT measured higher IOP compared to CST (0,39 mmHg) and GAT (0,44mmHg). Nevertheless, the deviation of the measurements was lower for CST compared to GAT (95% limits of agreement ±4,86). Additionally CCT was found higher when using CST compared to standard U/S pachymetry (9.22 um) and Pentacam (2.68 um). However, CST readings for CCT were closer to Pentacam compared to U/S pachymetry.


CST offers an alternative method for obtaining IOP and CCT readings. Its measurements are closer to those of GAT when compared to another air tonometer. The readings of CST appear to be higher than those of U/S pachymetry for CCT but closer to Pentacam. It is safe to conclude that Corvis ST is an alternative method for providing data adequate for glaucoma screening. Nevertheless, its significance for glaucoma monitoring and keratoconus screening is still under evaluation. FINANCIAL INTEREST: NONE

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