IOL Power Calculations and Cataract Surgery in Eyes with Previous Small Incision Lenticule Extraction
Roman Lischke1, Walter Sekundo2, Rainer Wiltfang3,4
1Department of Ophthalmology, University Hospital, Ludwig-Maximilians-University, 80337 Munich, Germany.
Journal of Clinical Medicine
|August 12, 2022
Summary
Accurate intraocular lens (IOL) power calculation after Small Incision Lenticule Extraction (SMILE) is crucial. Ray tracing demonstrated superior predictability compared to standard formulae in post-SMILE cataract surgery patients.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Biomedical Optics
Background:
- Small Incision Lenticule Extraction (SMILE) is a prevalent refractive procedure.
- Accurate intraocular lens (IOL) power calculation after SMILE presents challenges for cataract surgery.
- Limited data exists on IOL power calculation accuracy post-SMILE.
Purpose of the Study:
- To compare the accuracy of IOL power calculation in eyes that underwent SMILE.
- To evaluate ray tracing against empirically optimized formulae for post-SMILE IOL calculations.
Main Methods:
- A multicenter study involving 11 eyes undergoing cataract surgery post-SMILE.
- Comparison of IOL power calculation accuracy using ray tracing and ASCRS online calculator formulae.
- Analysis of mean absolute error and percentage of eyes within ±0.50/±1.00 D.
Main Results:
- Ray tracing achieved the smallest mean absolute error (0.40 D).
- Ray tracing provided the highest percentage of eyes within ±0.50 D (82%) and ±1.00 D (91%).
- The Potvin-Hill formula was the next best, with a mean absolute error of 0.66 D.
Conclusions:
- Ray tracing offers superior predictability for IOL power calculation in post-SMILE eyes.
- Empirically optimized formulae may be less accurate for post-SMILE IOL calculations.
- This study provides the first cohort data on IOL implantation after SMILE.
