Preop Prediction and Postop Determination of Actual Lens Position for Bi-Aspheric IOL Using High-Frequency Ultrasound: Final Results
Narrative Responses:
Purpose
To evaluate intraocular landmarks using high resolution ultrasound (UBM) prior to cataract surgery and compare these to the actual postop IOL position. The goal is to determine if the postop IOL position can be accurately predicted by these preop images.
Methods
This is an IRB approved study of 24 eyes from 24 patients. All eyes were imaged using UBM preoperatively. Patients were included only if preop images gave adequate visualization of the crystalline lens equator on both horizontal and vertical sections. The patients then underwent uncomplicated cataract surgery using a biaspheric, uniplanar IOL. Postoperatively all eyes were again imaged to show the final position of the IOL and this position was compared to the corresponding preoperative image landmarks. Back calculations for each patient using the Hollday II program were also done and related to the corresponding images.
Results
There is a general correlation between the final postoperative IOL position and certain preoperative landmarks seen on UBM. At the current time Dr. Holladay is in the final stages of evaluating the images and data. These results will be updated when complete.
Conclusion
Preoperative UBM imaging of cataract surgery patients may prove to be a useful tool to predict the Actual Lens Position (ALP) occurring after an uncomplicated cataract surgery. This could eventually improve the refractive accuracy of cataract surgery by reducing the variability inherent in preoperative effective lens positions (ELP) estimates.