Use of Intraoperative Aberrometry to Refine IOL Power Calculations: Retrospective Analysis of 200 Eyes
Narrative Responses:
Purpose
This retrospective analysis will examine the accuracy of intraoperative aberrometry-guided IOL power calculations compared to power calculations based on preoperative information for the same eyes.
Methods
In a series of 200 eyes undergoing cataract surgery, the IOL power implanted was chosen based on intraoperative aberrometry refractions from the ORA System (WaveTec Vision). The prediction error (MAVPE) and distribution of errors will be compared to the results that would have been obtained from the IOL powers calculated for the same eyes based on preoperative information alone.
Results
Using intraoperative aberrometry to guide the IOL power selection resulted in a mean absolute prediction error (MAVPE) of 0.26 D ± 0.21 D, compared to a prediction error of 0.32 D ± 0.25 D for IOL powers selected based on preoperative information alone. The difference in prediction error is statistically significant (p< 0.004). Postoperatively, 99% of all 200 eyes are within 1.00 D of the predicted spherical equivalent (SE) and 87% are within 0.50 D of predicted SE, compared to 97% and 80% for the preoperatively calculated IOL powers.
Conclusion
Experienced surgeons whose IOL power calculations typically result in good refractive outcomes can further improve cataract surgery refractive results by using intraoperative aberrometry to refine IOL power selection.