title: Visual function after implantation of an aspheric bifocal intraocular lens.
abstract: OBJECTIVE
  To evaluate distance, intermediate, and near vision after bifocal aspheric AcrySof ReSTOR SN6AD1 intraocular lens (IOL) implantation.
  
  
  METHODS
  Fernández-Vega Ophthalmological Institute, Oviedo, Spain.
  
  
  METHODS
  Binocular distance best corrected visual acuity (BCVA) (4.0 m), best distance-corrected near (40.0 cm) and intermediate (70.0, 60.0, 50.0 cm) acuities, and contrast sensitivity under photopic (85.0 candelas [cd]/m(2)) and mesopic (3.0 cd/m(2)) conditions with and without glare were measured postoperatively. A patient-satisfaction and visual phenomena questionnaire was administered.
  
  
  RESULTS
  Six months postoperatively, the mean acuities (logMAR) were binocular BCVA, -0.064 +/- 0.049 (SD); best corrected near, -0.041 +/- 0.061; best corrected intermediate, 0.147 +/- 0.130 (70.0 cm), 0.036 +/- 0.133 (60.0 cm), and -0.126 +/- 0.077 (50.0 cm). The BCVA and best corrected near acuity were 20/25 or better in all patients. Through-focus binocular logMAR acuities had 2 peaks at the expected far focus and near focus (0.00 diopter [D] and -2.40 D, respectively), with somewhat reduced acuity (20/32) at intermediate distances. Photopic contrast sensitivity was within the standard normal range. Mesopic contrast sensitivity was lower than under photopic conditions, particularly at higher spatial frequencies. Patients reported good performance for distance, near, and intermediate visual tasks with no or minimal difficulty with specific tasks. No patient reported severe visual phenomena; halos and glare were rated as none to moderate.
  
  
  CONCLUSIONS
  The aspheric IOL provided good functional vision at far and near, with lower performance at intermediate distance; good photopic contrast sensitivity and lower mesopic performance; and a low incidence of visual disturbances.
authors.affiliation: Fernández-Vega Ophthalmological Institute, Surgery Department, School of Medicine, University of Oviedo, Oviedo, Spain. j.alfonso@fernandez-vega.com
authors.forename: José F
authors.initials: JF
authors.lastname: Alfonso
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández-Vega
authors.forename: Hussein
authors.initials: H
authors.lastname: Amhaz
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
authors.forename: Beatriz
authors.initials: B
authors.lastname: Valcárcel
authors.forename: Teresa
authors.initials: T
authors.lastname: Ferrer-Blasco
mesh_terms: D000368:Aged; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D018918:Phacoemulsification; D011446:Prospective Studies; D011474:Prosthesis Design; D011795:Surveys and Questionnaires; D015348:Vision, Binocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology*