EVALUATING THE REPEATABILITY OF CORNEAL DENSITOMETRY MEASUREMENTS IN HEALTHY CORNEAS USING GALILEI G4

To assess corneal densitometry values obtained using Dual Scheimpflug Technology (Galilei G4)

Retrospective study

The topography results of patients over 16 who were examined between January 2020 and June 2024, had two consecutive corneal topographic examinations, and had no corneal pathology were meticulously and retrospectively reviewed. The lowest and the highest densitometry values of the central cornea were obtained in two consecutive measurements. These measurements were subjected to rigorous statistical analysis and evaluated regarding repeatability.

The study evaluated 62 eyes of 31 patients, 19 females and 12 males. The mean age of the patients was 33.93±15.71. The Bland-Altman method and intraclass correlation coefficients were used to evaluate the repeatability of the measurements. The difference between the two consecutive measurements at 95% acceptability limits was not statistically significant. (p: 0.608, p: 0.247, respectively).  In linear regression analysis, bias was detected in the lowest corneal density among the measurements, while there was no bias in the highest optical density.

Most of the corneal densitometry studies in the literature were performed with the Pentacam device. However, there is no study on the repeatability of corneal densitometry in healthy eyes with Galilei-G4. The repeatability of the highest corneal optical densitometry measurements with Dual Scheimpflug Technology is excellent, while the lowest densitometry measurements can be evaluated as good. Clinical practice can use corneal optical densitometry measurements using Dual Scheimpflug Technology