title: Visual and optical performance with the ReZoom multifocal intraocular lens.
abstract: OBJECTIVE
  This study evaluated visual acuity, contrast sensitivity, and wavefront aberrations after refractive multifocal intraocular lens (IOL) implantation.
  
  
  METHODS
  A prospective study comprising 174 eyes of 87 patients who had bilateral implantation of a multifocal IOL was carried out. A control group of 100 eyes of 50 age-matched patients with a monofocal IOL was used for comparison. Uncorrected and corrected distance and near visual acuity, contrast sensitivity (CS), and wavefront analysis (Hartmann-Shack) was performed 6 months after surgery. Contrast sensitivity was tested for distance and near under mesopic (2 cd/m2) and photopic conditions (90 cd/m2).
  
  
  RESULTS
  Distance photopic CS was not significantly different from the monofocal group, while distant mesopic CS and near photopic and mesopic CS were significantly lower. Mean aberration root mean square (RMS) values for the multifocal IOL group were 0.229 ± 0.103 µm for coma, 0.137 ± 0.067 µm for spherical aberration (SA), and 0.301 ± 0.133 µm for higher order aberrations (HOAs). Strehl ratio averaged 0.096 ± 0.045.
  
  
  CONCLUSIONS
  Distant visual performance with the multifocal IOL was excellent under photopic conditions, but was reduced under mesopic levels. Near vision showed suboptimal results in both photopic and mesopic conditions. Coma, SA, and HOAs with the multifocal IOL were higher than those reported previously, with a lower Strehl ratio.
authors.affiliation: Refractive Surgery Department, Centro Oftalmológico Marqués de Sotelo and Hospital NISA Valencia al Mar, Valencia, Spain.
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Muñoz
authors.forename: César
authors.initials: C
authors.lastname: Albarrán-Diego
authors.forename: Alejandro
authors.initials: A
authors.lastname: Cerviño
authors.forename: Teresa
authors.initials: T
authors.lastname: Ferrer-Blasco
authors.forename: Santiago
authors.initials: S
authors.lastname: García-Lázaro
mesh_terms: D057128:Aberrometry; D000368:Aged; D000369:Aged, 80 and over; D015350:Contrast Sensitivity / Q000502:physiology*; D057108:Corneal Wavefront Aberration / Q000503:physiopathology*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D019591:Pseudophakia / Q000503:physiopathology*; D012029:Refraction, Ocular / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology*