Intraoperative Aberrometry Predictive Value for Astigmatism Power in Light-Adjustable IOL Treatment Refraction
Purpose
To analyze the intra-operative aphakic and pseudophakic astigmatism readings obtained in light adjustable IOLs and control cases to determine if these readings correlated to refractive astigmatism in the post-operative period.
Methods
Retrospective analysis of a series of 15 consecutive eyes undergoing cataract surgery with implantation of light adjustable IOLs during an FDA trial. Pre-operative keratometry, intra-operative aberrometry, and post-operative keratometry readings were obtained to determine the magnitude of astigmatism present. These were compared with post-operative pre-adjustment manifest refractions to determine which readings were most predictive in regards to the final treatment refraction. Statistical analysis was done to determine which set of readings were more predictive for final treatment refraction.
Results
The average mean deviation from pre-operative K readings to post operative manifest cylinder was: -0.29D (+/- 0.48D). The average mean deviation from intra-operative aphakic cylinder to manifest cylinder was -0.20D (+/-0.41D) The average mean deviation from intra-operative pseudophakic cylinder to manifest cylinder was 0.14D (+/-0.44D). The average mean deviation from post-operative keratometry cylinder to manifest cylinder was 0.1D (+/-0.36D).
Conclusion
Post-operative keratometry value was the best indicator of manifest cylinder power and pre-operative keratometry was the worse indicator of manifest cylinder power. Intra-operative aberrometry was a better indicator of manifest cylinder power than pre-operative keratometry.