title: Far and near visual acuity with multifocal intraocular lenses in an optomechanical eye model with imaging capability.
abstract: OBJECTIVE
  To compare the quantitative and qualitative visual performances of different multifocal intraocular lenses (IOLs) in an experimental model of the human eye.
  
  
  METHODS
  University Hospital San Raffaele, Milan, Italy.
  
  
  METHODS
  Five multifocal IOLs and 1 monofocal IOL were implanted in an optomechanical eye model with imaging capability. The comparative optical characterization of the imaging performance included aberrometry, simulated visual acuity testing at variable contrast for far and near distance, glare tests, and image records of optotype charts.
  
  
  RESULTS
  The maximum recorded far visual acuity for the monofocal IOL was between 20/12.5 and 20/16; the multifocal IOLs decreased visual acuity by 1 to 2 lines. The difference tended to increase at reduced contrast. Full-contrast near visual acuity with multifocal IOLs ranged between 20/63 and 20/25; the near distance performance of the monofocal IOL without an additional correcting lens was worse by 1 to 3 lines of acuity with large pupils but was comparable with small pupils. Multifocal IOLs of different designs showed marked differences as a function of contrast, which tended to balance between far and near behaviors.
  
  
  CONCLUSIONS
  Multifocal IOLs of different optical designs were well characterized and distinguished by simulated contrast acuity testing in an experimental eye model, allowing quantitative comparison. Their overall visual performance, averaged over contrast and distance, was not superior to the performance of a monofocal IOL without an additional correcting lens.
authors.affiliation: Laser Medicine Research, Department of Ophthalmology, University Hospital San Raffaele, Via Olgettina 60, Milan 20132, Italy. p.gobbi@hsr.it
authors.forename: Pier Giorgio
authors.initials: PG
authors.lastname: Gobbi
authors.forename: Francesco
authors.initials: F
authors.lastname: Fasce
authors.forename: Stefano
authors.initials: S
authors.lastname: Bozza
authors.forename: Giliola
authors.initials: G
authors.lastname: Calori
authors.forename: Rosario
authors.initials: R
authors.lastname: Brancato
mesh_terms: D015350:Contrast Sensitivity / Q000502:physiology*; D019466:Glare; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008954:Models, Biological; D011474:Prosthesis Design; D014792:Visual Acuity / Q000502:physiology*