Biometric Measurements to Determine Appropriate IOLs Power

Summary

Sydney Tyson, MD, MPH explains the crucial steps in determining the appropriate intraocular lenses (IOLs) for cataract surgery. He emphasizes the initial optimization of the ocular surface, addressing it as a significant factor influencing the outcome of cataract surgery. To achieve accurate measurements, Tyson recommends modern IOL calculation formulas integrated into advanced biometers. He underscores the need to measure corneal asphericity, distinguishing between prolate and oblate shapes, which is particularly relevant for post-myopic Lasik patients.

The measured spherical aberration number informs clinicians about the expected image degradation, crucial for choosing the right IOL. Total aberration of the eye, including spherical aberration, is also considered, providing insights into potential success with these lenses. Tyson emphasizes the significance of pupil size measurements, as larger pupils amplify aberrations exponentially, affecting vision in different lighting conditions.