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Repeatability and normal data of biomechanics measured by a Scheimpflug-based non-contact device on normal corneas

Poster Details

First Author: G.Nemeth SWITZERLAND

Co Author(s):    Z. Hassan   E. Szalai   A. Berta   L. Modis     

Abstract Details


To analyze measurement repeatability and normal data with a new device assessing corneal biomechanics, and to examine correlations between these data and age and biometric parameters in healthy eyes.


Department of Ophthalmology, Medical Health and Science Center, University of Debrecen, Hungary


Inclusion criteria were healthy eyes with <2.0 D refractive error. Exclusion criteria were any intraocular surgery or contact lens wearing. We had taken three consecutively images with CorVis ST device based on Scheimpflug imaging, which after we axial length and keratometric data were determined with IOLMaster.


60 eyes of 60 patients were included in our study (age: 63.55ḟ14.20 years). Pachymetric and intraocular pressure data show excellent repeatability (Cronbach alpha >0.95). Highest concavity and first applanation time show good repeatability (Cronbach alpha >0.88), but repeatability of the other specific parameters are poor. There were no significant correlation between age, axial length and specific CorVis ST parameters (r2=0.24; p=0.27; r2=0.23; p=0.33, respectively). Significant correlations were observed between flattest, steepest keratometric data and CorVis ST parameters (r2=0.41; p<0.01 and r2=0.42; p<0.01, respectively). Strong correlation was observed between intraocular pressure and the measured device specific parameters (r2=0.97; p<0.001).


Measurement repeatability for intraocular pressure and corneal thickness are high with the new device assessing corneal biomechanics. The usefulness of the other eight device-specific parameters are questionable and needs for further clarification in different corneal diseases.

Financial Disclosure:


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