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One year experience with an extended-depth-of-focus (EDF) IOL

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Session Details

Session Title: Cataract II
Session Date/Time: Saturday 27/02/2016 | 08:30-11:00
Paper Time: 10:06
Venue: Trianti Room
First Author: : P.Hoffmann GERMANY
Co Author(s): :    M. Abraham   L. Zumhagen           

Abstract Details


EDF lenses potentially yield quality of vision similar to a monofocal IOL but with extended depth of focus substantially improving intermediate vision. We report on one year experience with the AMO Symfony IOL. This lens is aspheric, provides approx. 1.5 D of pseudoaccomodation and reduces chromatic aberration.


Private eye clinic in Germany- Augenklinik Castrop-Rauxel


We reviewed all Symfony charts up to July 2015. In 72 eyes of 37 patients we identified complete data sets. For IOL power calculation, a raytracing software (Okulix 8.9) was used. 50 out of 72 procedures were carried out femtosecond-laser assisted (B&L Victus). 4-8 weeks (median 41 days) the following parameters were examined: refraction, DCVA and UCVA monocular and binocular, uncorrected intermediate (80 cm) and near (exempted distance, mostly 40-45 cm) acuity monocular/binocular. In 12 patients, defocus curves were recorded.


Refraction (mean±standard deviation) was +0.02 ± 0.29 D sph –0.22 ± 0.23 D cyl. Refractive prediction error was ±0.06 ± 0.29 D. 93% of all eyes had a prediction error of ≤ 0.5 D. LogMAR DCVA was –0.06 ± 0.10, binocular –0.08 ± 0.10, UCVA monocular –0.01 ± 0.10 and binocular –0.04 ± 0.10. Binocular uncorrected intermediate acuity ±0.01 ± 0.11. Near acuity was ±0.17 ± 0.07. The defocus curve shows an acuity of 0.0 logMAR or better from ∞ to a defocus of –1.5 D. In fs-laser-assisted eyes, refractive predictability was slightly better than in manually operated eyes.


The EDF IOL allows for distance acuity at least on par with a good monofocal lens. Intermediate and near acuity will be approx. 3 lines (0.3 logMAR steps) better. Refractive predictability is excellent. Vision will be excellent from ∞ down to 65 cm without dips in the defocus curve. Most patients desire some amount of near add for reading small print, typically 1.25 D comparable to a 47 year old phacic subject. Unwanted optical effects esp. halos will be less than with a classical diffractive bi- or trifocal IOL.

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