title: In vitro optical quality comparison between the Mini WELL Ready progressive multifocal and the TECNIS Symfony.
abstract: OBJECTIVE
  To compare the optical quality between two intraocular lenses (IOLs): the Mini WELL Ready progressive multifocal (SIFI Medtech, Catania, Italy), and the TECNIS Symfony (Abbott Laboratories, Illinois, USA), which both provide a continuous range of vision from far to near positions.
  
  
  METHODS
  The in vitro optical quality of each lens was assessed with an instrument conceived for measuring the modulation transfer function (MTF). The optical quality of each lens was described in terms of MTF, through-focus MTF, defocus tolerance, pupil dependence, and Strehl ratio MTF. These metrics were assessed for the best lens far focus, and at four vergences (from -1.5 to -3.0 D in 0.5-D steps), at 3.0 and 4.5 mm apertures.
  
  
  RESULTS
  The through-focus curves of each lens showed two main areas: one corresponding to far-distance vision, and another to intermediate- and near-distance vision. Both lenses showed similar MTF curves and Strehl ratio values at both apertures. The optical quality of both lenses slightly decreased with the aperture for all vergences. Nevertheless, the quality of the progressive multifocal lens increased with the aperture at far-distance vision. This lens also showed the largest defocus tolerance at near-distance vision for both apertures.
  
  
  CONCLUSIONS
  The results obtained in the present study suggest that both designs might enlarge the depth of focus. Whereas, the Mini WELL Ready showed better optical quality than the TECNIS Symfony at far vision with 4.5 mm aperture, and larger defocus tolerance than the diffractive lens at near-distance vision.
authors.affiliation: From the Optometry Research Group (GIO), Department of Optics and Optometry and Vision Science, University of Valencia, Valencia, Spain. alberto.vicent@uv.es.|Department of Optics, University of Valencia, C/ Dr Moliner, 50, 46100, Burjassot, Spain. alberto.vicent@uv.es.
authors.forename: Alberto
authors.initials: A
authors.lastname: Domínguez-Vicent
authors.affiliation: From the Optometry Research Group (GIO), Department of Optics and Optometry and Vision Science, University of Valencia, Valencia, Spain.
authors.forename: Jose Juan
authors.initials: JJ
authors.lastname: Esteve-Taboada
authors.affiliation: From the Optometry Research Group (GIO), Department of Optics and Optometry and Vision Science, University of Valencia, Valencia, Spain.
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Del Águila-Carrasco
authors.affiliation: From the Optometry Research Group (GIO), Department of Optics and Optometry and Vision Science, University of Valencia, Valencia, Spain.
authors.forename: Teresa
authors.initials: T
authors.lastname: Ferrer-Blasco
authors.affiliation: From the Optometry Research Group (GIO), Department of Optics and Optometry and Vision Science, University of Valencia, Valencia, Spain.
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
mesh_terms: D006801:Humans; D008422:Materials Testing / Q000379:methods*; D055095:Optics and Photonics / Q000592:standards*; D054120:Phakic Intraocular Lenses / Q000592:standards*; D011474:Prosthesis Design
keywords: Extended depth of focus; In vitro measurements; Multifocal intraocular lens; Optical quality