Comparison of change in mean topographic keratometry with spherical equivalent refraction after LASIK and SMILE
Session Details
Session Title: Corneal Refractive Surgery
Session Date/Time: Tuesday 17/09/2019 | 14:00-16:00
Paper Time: 14:57
Venue: Free Paper Forum: Podium 3
First Author: : T.Archer UK
Co Author(s): : D. Reinstein G. Carp R. Vida
Abstract Details
Purpose:
To evaluate the change in mean keratometry and the change in spherical equivalent refraction (SEQ) after LASIK or SMILE.
Setting:
London Vision Clinic, London, UK
Methods:
Retrospective study of LASIK and SMILE procedures with Atlas keratometry data before and 3 months after surgery. Analysis was performed for myopic LASIK, hyperopic LASIK, and myopic SMILE. Inclusion criteria were CDVA 20/40 or better and SEQ treated 0.75D and higher. Mixed cylinder cases were excluded. Correlation and regression analysis was performed between the change in mean keratometry and the change in SEQ. The ratio of change in mean keratometry and change in SEQ was calculated.
Results:
Myopic LASIK (n=7,251): SEQ change was -4.40±2.56D (-0.38 to -17.63D) and K change was -3.24±1.54D (-0.18 to -10.54D). K/SEQ ratio was 0.79±0.21 (0.18 to 3.44).
Hyperopic LASIK (n=5,090): SEQ change was +2.95±1.46D (+0.38 to +9.75D) and K change was +2.23±1.34D (-0.44 to +8.04D). K/SEQ ratio was 0.74±0.24 (-0.25 to 2.93).
SMILE (n=4,222): SEQ change was -5.37±2.50D (-0.50 to -15.25D) and K change was -4.13±1.42D (-0.45 to -8.85D). K/SEQ ratio was 0.83±0.18 (0.30 to 2.52). K/SEQ correlation was non-linear with less K change for higher corrections for LASIK, but SMILE was linear.
Conclusions:
Change in keratometry was found to have a non-linear relationship with change in SEQ for both myopic and hyperopic LASIK. The K/SEQ ratio was highest for SMILE, followed by myopic LASIK, and the lowest ratio was found for hyperopic LASIK.
Financial Disclosure:
receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented
