Posters

Corneal thickness assessment in healthy eyes: comparison between two different Scheimpflug devices

Poster Details

First Author: L.Vitiello ITALY

Co Author(s):    M. De Bernardo   A. Coppola   S. Pagliarulo   R. Albano   G. Marotta   N. Rosa     

Abstract Details

Purpose:

To evaluate the correlation between corneal thickness (CT) measurements obtained with two Scheimpflug devices, Pentacam HR and Precisio, and to elaborate, if possible, a regression formula which could make these results comparable.

Setting:

University Eye Clinic, Department of Medicine, Surgery and Dentistry, “Scuola Medica Salernitana”, University of Salerno, Italy.

Methods:

124 healthy eyes of 124 volunteers (65 males; mean age: 26.48±1.70, range: 22-35 years) were included in this study. CT was measured using Pentacam HR and Precisio in three different points: the pupil center (PC), the corneal apex (CA) and the thinnest point (TP). The Student paired T test and Pearson correlation coefficient (R) were used to calculate the statistical significance and the correlation between the two devices. Reliability and agreement were defined using intraclass correlation coefficient, Bland-Altman plots and 95% confidence interval of limits of agreement. P values less than 0.01 were considered statistically significant.

Results:

CT obtained with both devices at the PC, at the CA and at the TP showed a good correlation (R=0.97, R=0.97, R=0.97, respectively). The differences between Pentacam HR and Precisio were 21.9±8.8 μm at the PC, 21.9±8.9 μm at the CA, 19.1±9.1 μm at the TP, showing that Pentacam HR measurements were significantly thicker than those provided by Precisio (p<0.01). Regression formulas to correlate these findings were identified.

Conclusions:

The results provided by this study highlight that Precisio measures thinner corneas compared to Pentacam HR. The identified regression formulas could be utilized to make interchangeable the results obtained with these two devices.

Financial Disclosure:

None