The accuracy of IOL power calculations continues to improve with the use of modern instruments for biometry, updated formulas, and constant optimization. However, unusual eyes still present a challenge, and residual refractive error still occurs in a clinically significant proportion of normal cases, said Giacomo Savini, MD.
The accuracy of IOL power calculations continues to improve with the use of modern instruments for biometry, updated formulas, and constant optimization. However, unusual eyes still present a challenge, and residual refractive error still occurs in a clinically significant proportion of normal cases, said Giacomo Savini, MD.
“In my opinion, it is always wise not to overpromise because approximately 15% of eyes may have a prediction error >0.50 D,” said Dr. Savini, private practice, Studio Oculistico d’Azeglio, Bologna, Italy, and researcher, IRCCS GB Bietti Foundation, Rome, Italy. “In particular, surgeons might advise patients who are choosing a multifocal IOL that a laser enhancement may be necessary to reach emmetropia in up to 10% of cases.”
Dr. Savini said that while the available optical biometers represent different technologies, it is not possible to say that one is more accurate than another.
“More or less, the modern biometers are doing the same job, and the choice among them will not affect the final outcome,” he explained. “In studies we did comparing power calculations using data from three different biometers in five different formulas, the results were very close with a prediction error ≤0.5 D achieved in approximately 80% to 90% of eyes.”
Giacomo Savini, MD
E: [email protected]
This article is based on a paper presented by Dr. Savini at the 37th Congress of the European Society of Cataract and Refractive Surgeons. Dr. Savini is a consultant to, a speaker for, and/or receives research support from companies that manufacture IOLs and instruments for biometry.
