[Impact of Near Addition on the Optical Quality of Diffractive Multifocal Intraocular Lenses - a Laboratory Study...

Purpose To analyse the optical quality of diffractive multifocal intraocular lenses (IOLs) with different near additions in a laboratory study. Methods We analysed the AcrySof^® IQ ReSTOR^® + 2.5 D SV25T0 (Alcon Laboratories inc., Fort Worth, USA), the AcrySof^® IQ ReSTOR^® + 3.0 D SN6AD1 (Alcon, USA) and the TECNIS^® ZMA00 and ZMB00 (Abbott Medical Optics, USA) with a power of 21D for the distance, using the OptiSpheric^® IOL PRO optical bench (TRIOPTICS, Wedel, Germany). The lenses have a similar optical design but different near additions: The ReSTOR + 2.5 D has a near addition of + 2.5 D, the ReSTOR + 3.0 D has a near addition of + 3.0 D and both TECNIS IOLs have a near addition of + 4.0 D. We evaluated the modulation transfer function area (MTFA) and the Strehl ratio. Additionally the optical qualities of the IOL were compared using USAF (United States Air Force)-Target pictures. Results The MTFA at the far focus (ReSTOR + 2.5 D/ReSTOR + 3.0 D/TECNIS) was 47.85/42.06/33.57. The MTFA was 11.05/9.54/8.60 for intermediate distances. MTFA at the near focus was 20.11/29.50/33.39. The Strehl ratio was 0.48/0.42/0.29 at the far focus, 0.11/0.10/0.09 at the intermediate focus and 0.20/0.30/0.34 at the near focus. The USAF Target pictures correlated with these measurements. Conclusion At the near focus, the TECNIS ZMA00 and ZMB00 performed the best, while the ReSTOR + 2.5 D performed the worst. At the intermediate distance, all IOLs achieved similar results. At the far focus, the ReSTOR + 2.5 D performed the best. Surgeons can choose the right IOL for the patients' individual needs, because a broad range of near additions in diffractive multifocal IOLs is available these days.