Comparison of corneal power measurement between Corneal Topography and Auto Ref/Keratometer

Authors

  • Batoul Saoud Tishreen University
  • Habib Youssef Tishreen University

Abstract

Abstract:

Purpose:

 To compare corneal power measurements using Auto ref/keratometer(GR-3500KA) and corneal topography(SIRIUS).

Methods:

87 eyes of 45 patients were included in this study. Flattest, steepest and average corneal powers were measured using corneal topography then auto ref/keratometer. The Intra Ocular Lens(IOL) power was measured using SRK-T formulae with steepest and flattest corneal powers measured by Sirius and GR-3500KA  separately and the results were compared.

We also studied the correlation between average central  radius of curvature of anterior corneal surface, and the difference in average corneal power measurements between the two devices  using Pearson correlation.

Results:

Mean steep corneal power using Auto Ref/Keratometer and Corneal Topography was: 43.98±1.07 and 43.85±1.09 diopters respectively, and the difference was statistically significant

Mean flat corneal power using auto ref/keratometer and corneal topography was: 42.68±13.08 and 42.76±1.1 diopters respectively, and the difference was statistically significant .

Mean average corneal power using auto ref/keratometer and corneal topography: 43.24±1.03 and 43.35±1.01 diopters respectively, and the difference was statistically significant.

Mean IOL power(SRK-T) using steep and flat corneal powers obtained by Auto- ref/keratometer and corneal topography separately were: 19.20±3.6 and  19.32±3.5 diopters respectively, and the difference was statistically significant.

Negative correlation was found between central average radius of curvature of anterior corneal surface, and the difference in average corneal power measurements.

Conclusion:

 Auto Ref/Keratometer gives consistently higher measurements for corneal powers compared to corneal topography (SIRIUS). And such a difference does not significantly affect the IOL power.

Key words:

 using Auto Ref/Keratometer, corneal power, corneal  topography, IOL power.

Published

2023-03-01

How to Cite

1.
سعود ب, حبيب يوسف. Comparison of corneal power measurement between Corneal Topography and Auto Ref/Keratometer. Tuj-hlth [Internet]. 2023Mar.1 [cited 2024Jul.15];44(6):249-5. Available from: https://journal.tishreen.edu.sy/index.php/hlthscnc/article/view/14026