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This retrospective study reports on single site, single surgeon outcomes and compares the prediction error resulting from the calculated IOL to IOL recommended by intraoperative aberrometry. The investigator hopes to answer the question that all surgeons ask...is ORA better than formula for post-refractive cataract patients?
We compare the absolute prediction error of the ASCRS online calculator to the prediction error of intraoperative aberrometry on post-refractive eyes receiving IOLs during cataract surgery. Retrospective chart review including through EHR as well as manual review of data and ASCRS calculator. Post op MRSE will be used to back-calculate prediction error of the various formulas. Statistical Considerations: We should have approximated 150 patients in 3 subgroups: 10 RK, 30 post Hyperopic PRK/LASIK and 110 Post Myopic PRK/LASIK
This represents interim data at post-op data is still being processed. A retrospective chart review of 156 patients undergoing cataract surgery who had had prior refractive surgery were analyzed from June 2013 to May of 2019. 54 Eyes had post-operative refractions available. Ora had a Mean (SD) 0.71(0.63) while the ASCRS calculator had a Mean 0.70(0.59) with a P-value 0.856. 51.9% of ORA patients were within 0.5D of predicted and 47.2% for the ASCRS calculator group with a p- value of 0.628. No subgroup was statistically significant.
At this point in the analysis, the data show similar outcomes between using ORA and the ASCRS calculator for post refractive cases with no statistically significant differences. The study however is limited due to small sample size and a lack of post-operative refractions. As additional data is input, we anticipate a more significant difference.