Retrospective Comparison of Accuracy of Standard Preoperative IOL Calculations Versus Intraoperative Calculations Using Wavefront Aberrometer
Narrative Responses:
Purpose
A comparison of the accuracy of standard preoperative intraocular lens calculations (IOL Master) versus intraoperative calculations using the ORA system.
Methods
Retrospective comparison using 179 Dean McGee Eye Institute patients who underwent cataract surgery using the ORA system. Patients were excluded if they had post-op BCVA < 20/25 and if the surgeon chose a lens other than recommended by either the IOL Master or ORA system. We began with 278 patients and 99 were excluded. Based on lens recommendation from either method, we looked at which system came closest in terms of predicted refraction. We separated data into groups of post-lasik, post-RK, and post-PRK, and all post-refractive to see the importance of using the ORA system in this patient population.
Results
We found no significant difference in accuracy for the ORA system vs IOL Master in general or in any of the subgroups (post-LASIK, post-PRK, etc).
Conclusion
Patients should be provided data supporting use of the ORA system and the extra expense it entails. It has been eluded that the ORA system is better at predicting lens choice in post-refractive patients and this study shows no conclusive evidence that it is superior to the IOL Master calculations.