title: Symmetric bilateral implantation of a distance-dominant diffractive bifocal intraocular lens.
abstract: OBJECTIVE
  To assess visual results after symmetrical bilateral implantation of a distance-dominant bifocal diffractive intraocular lens (IOL).
  
  
  METHODS
  Fernández-Vega Ophthalmological Institute, Oviedo, Spain.
  
  
  METHODS
  Fifty patients had bilateral implantation of a distance-dominant diffractive bifocal 447D IOL (Acri.Tec GmbH) in a prospective study. Monocular and binocular best corrected distance visual acuities and best distance-corrected near visual acuity, binocular best distance-corrected intermediate visual acuity, and distance contrast sensitivity under photopic (85 cd/m(2)) and mesopic (5 cd/m(2)) conditions were determined.
  
  
  RESULTS
  At the 6-month postoperative visit, the mean binocular best corrected distance acuity and best corrected distance near acuity were 0.02 +/- 0.04 logMAR and 0.04 +/- 0.03 logMAR, respectively. Binocular best corrected distance intermediate visual acuity worsened significantly as a function of the distance of the test: from 0.04 +/- 0.03 logMAR at 33 cm to 0.21 +/- 0.08 logMAR at 70 cm (P<.01). Contrast sensitivity was within normal limits under photopic and mesopic conditions. Binocular contrast sensitivity was statistically significantly better than monocular contrast sensitivity at all spatial frequencies under both illumination levels (P<.01).
  
  
  CONCLUSIONS
  Bilateral implantation of the distance-dominant bifocal 447D IOL provided good simultaneous distance, near, and intermediate vision with improved contrast sensitivity under photopic and mesopic conditions.
authors.affiliation: Fernández-Vega Ophthalmological Institute, Oviedo, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández-Vega
authors.forename: José F
authors.initials: JF
authors.lastname: Alfonso
authors.forename: M Begoña
authors.initials: MB
authors.lastname: Baamonde
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015350:Contrast Sensitivity / Q000502:physiology; D003867:Depth Perception / Q000502:physiology; D004215:Distance Perception / Q000502:physiology; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D011446:Prospective Studies; D015348:Vision, Binocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology