title: Modulation transfer function and optical quality after bilateral implantation of a +3.00 D versus a +4.00 D multifocal intraocular lens.
abstract: OBJECTIVE
  To determine whether the improvement in intermediate vision after bilateral implantation of an aspheric multifocal intraocular lens (IOL) with a +3.00 diopter (D) addition (add) occurs at the expense of optical quality compared with the previous model with a +4.00 D add.
  
  
  METHODS
  Department of Ophthalmology, University of São Paulo, São Paulo, Brazil.
  
  
  METHODS
  Prospective randomized double-masked comparative clinical trial.
  
  
  METHODS
  One year after bilateral implantation of Acrysof Restor SN6AD1 +3.00 D IOLs or Acrysof Restor SN6AD3 +4.00 D IOLs, optical quality was evaluated by analyzing the in vivo modulation transfer function (MTF) and point-spread function (expressed as Strehl ratio). The Strehl ratio and MTF curve with a 4.0 pupil and a 6.0 mm pupil were measured by dynamic retinoscopy aberrometry. The uncorrected and corrected distance visual acuities at 4 m, uncorrected and distance-corrected near visual acuities at 40 cm, and uncorrected and distance-corrected intermediate visual acuities at 50 cm, 60 cm, and 70 cm were measured.
  
  
  RESULTS
  Both IOL groups comprised 40 eyes of 20 patients. One year postoperatively, there were no statistically significant between-group differences in the MTF or Strehl ratio with either pupil size. There were no statistically significant between-group differences in distance or near visual acuity. Intermediate visual acuity was significantly better in the +3.00 D IOL group.
  
  
  CONCLUSIONS
  Results indicate that the improvement in intermediate vision in eyes with the aspheric multifocal + 3.00 D add IOL occurred without decreasing optical quality over that with the previous version IOL with a +4.00 D add.
authors: Cole Eye Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44114, USA. marconysanthiago@hotmail.com
authors: Marcony R
authors: MR
authors: Santhiago
authors: Steven E
authors: SE
authors: Wilson
authors: Marcelo V
authors: MV
authors: Netto
authors: Ramon C
authors: RC
authors: Ghanen
authors: Mario Luis R
authors: ML
authors: Monteiro
authors: Samir J
authors: SJ
authors: Bechara
authors: Edgar M
authors: EM
authors: Espana
authors: Glauco R
authors: GR
authors: Mello
authors: Newton
authors: N
authors: Kara
mesh_terms: D057128:Aberrometry; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D055095:Optics and Photonics; D018918:Phacoemulsification; D011446:Prospective Studies; D019591:Pseudophakia / Q000503:physiopathology*; D011680:Pupil / Q000502:physiology; D042262:Retinoscopy; D011795:Surveys and Questionnaires; D014792:Visual Acuity / Q000502:physiology*