Article

IOL power calculation in post-laser refractive eyes to be easier

A new tool for pseudophakic IOL power calculation in post-laser refractive surgery eyes will help cataract surgeons provide more accurate refractive outcomes.

Key Points

Dr. Hoffer collaborated with Giacomo Savini, MD, Bologna, Italy, in creating this tool. It is a project that grew out of meetings of the IOL Power Club, an organization formed to develop new solutions for enhancing IOL power calculations and for defining guidelines from evidence-based medicine.

The tool being developed is a one-page spreadsheet that will allow entry of all the biometric data necessary for the large number of methods that have been published for estimated K readings and IOL power adjustment. It then automatically calculates those values and provides recommendations of which K reading to use and also on the most advisable IOL power.

"Everyone who does cataract surgery knows that IOL power calculation in eyes that have undergone laser vision correction is a challenge because we cannot measure the true corneal power and the index of refraction of the cornea has changed. Many methods have been proposed to overcome those problems, but the question arises of which is the right one to use. Often, the surgeon winds up falling back on the easiest approach," said Dr. Hoffer, clinical professor of ophthalmology, Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, and a private practitioner in Santa Monica, CA.

"With this spreadsheet, the surgeon still needs to know what data to collect," Dr. Hoffer said. "The spreadsheet clues you to what is needed, and after the information is entered, the program will eliminate the need for pencil and paper because it does all of the calculations automatically. In addition, by allowing all of the data collected preoperatively and postoperatively to be recorded in a single, printable sheet, it also has a potential benefit for medicolegal purposes if documentation ever becomes necessary."

Two sections

Dr. Hoffer explained that the spreadsheet is divided into two sections based on the two basic methods proposed. One section includes formulae for estimating true corneal power and the other includes methods for adjusting the target IOL power. Within each of those sections, the formulae are subcategorized further into those that require historical clinical biometric data and those that can be used with the patient's current data. It also lists aphakic refraction methods that do not require any preoperative biometric data, but depend on performing refraction in or out of the OR after the cataract is removed.

Newsletter

Don’t miss out—get Ophthalmology Times updates on the latest clinical advancements and expert interviews, straight to your inbox.

Related Videos
Shehzad Batliwala, DO, aka Dr. Shehz, discussed humanitarian ophthalmology and performing refractive surgery in low-resource, high-risk areas at the ASCRS Foundation Symposium.
(Image credit: Ophthalmology Times) ASCRS 2025: Advancing vitreous care with Inder Paul Singh, MD
(Image credit: Ophthalmology Times) The Residency Report: Study provides new insights into USH2A target end points
Lisa Nijm, MD, says preoperative osmolarity testing can manage patient expectations and improve surgical results at the 2025 ASCRS annual meeting
At the 2025 ASCRS Annual Meeting, Weijie Violet Lin, MD, ABO, shares highlights from a 5-year review of cross-linking complications
Maanasa Indaram, MD, is the medical director of the pediatric ophthalmology and adult strabismus division at University of California San Francisco, and spoke about corneal crosslinking (CXL) at the 2025 ASCRS annual meeting
(Image credit: Ophthalmology Times) ASCRS 2025: Taylor Strange, DO, assesses early visual outcomes with femto-created arcuate incisions in premium IOL cases
(Image credit: Ophthalmology Times) ASCRS 2025: Neda Shamie, MD, shares her early clinical experience with the Unity VCS system
Patricia Buehler, MD, MPH, founder and CEO of Osheru, talks about the Ziplyft device for noninvasive blepharoplasty at the 2025 American Society of Cataract and Refractive Surgeons (ASCRS) annual meeting
(Image credit: Ophthalmology Times) ASCRS 2025: Bonnie An Henderson, MD, on leveraging artificial intelligence in cataract refractive surgery
© 2025 MJH Life Sciences

All rights reserved.