Comparison of Anterior Corneal Curvature Measurements Using a Galilei Dual Scheimpflug Analyzer and Topcon Auto Kerato-Refractometer

Abstract EN

Purpose.

To compare anterior corneal keratometry (K) measurements taken by a dual Scheimpflug analyzer and an auto kerato-refractometer.

Methods.

Sixty-four normal eyes underwent keratometric measurements with both devices.

The repeatability of the auto kerato-refractometer measurements was assessed by calculating the coefficient of variation (COV).

The interdevice agreement was evaluated using the Bland-Altman analysis, Pearson correlation coefficient, and paired two-tailed t -test.

Results.

The COV of the flat K and steep K measurements taken by the auto kerato-refractometer were 0.21% and 0.29%, respectively.

There were no significant differences between the steep K and average K measurements for the Topcon and Galilei devices ( P = 0.475, and P = 0.137, resp.).

The Galilei flat K values were lower than those of the Topcon ( P = 0.002).

Both of the instruments showed good agreement for all anterior corneal keratometric values.

There was a significant linear correlation between the Galilei and Topcon devices for the flat K ( r = 0.989, P < 0.0001), steep K ( r = 0.987, P < 0.0001), and average K values ( r = 0.994, P < 0.0001).

Conclusions.

The anterior corneal flat keratometric values were not interchangeable between the Galilei and Topcon devices.

However, the measurements of the two instruments showed significant linear correlation with each other.