Keynote Lecture Saturday

Awarding Ceremony: Albrecht-von-Graefe Medal
and Albrecht-von-Graefe Memorial Lecture

2017 marks the 50th anniversary of the Svyatoslav Nikolayevich Fyodorov’s publication of the first IOL calculation formula. IOL calculations are performed today with at least three different approaches: vergence formula, ray tracing, and artificial intelligence. Input data for various formulas include anterior corneal power (with total corneal power derived from anterior corneal measurements), axial length, anterior chamber depth, lens thickness, corneal diameter, corneal topography, patient age, and preoperative refraction. Each formula uses some portion of these data in the calculations, and the explicit or implied goal is to accurately predict effective lens position (ELP). The best outcomes for normal eyes are up to 90% within 0.5 diopters of target. Accuracy is less for short eyes and eyes with atypical corneas: postrefractive, ectatic, and postkeratoplasty. Steps to improve accuracy will include obtaining accurate measurement of posterior corneal curvature, accounting for IOL tilt and centration, and yet-to-be determined measurements to improve accuracy for predicting ELP. Methods of postoperative adjustment of IOL power show promise for addressing unwanted postoperative refractive errors.

Douglas D. Koch is Professor of Ophthalmology at Baylor College of Medicine in Houston, TX. Since the early 1980s, he has been focusing on cataract and refractive surgery. An internationally renowned specialist and winner of numerous awards, Professor Koch has served as principle investigator in more than twenty research projects on the development of LASIK, excimer laser systems, and IOL. In 2016, Professor Koch presented the Jackson Memorial Lecture at the Annual Meeting of the American Academy of Ophthalmology.

von Graefe Saal 11:45 - 12:15 30.09.2017
Keynote Lecture Sa09
Challenges in IOL calculations