title: Theoretical Effect of Lens Position and Corneal Curvature on the Near Focal Point of Multifocal Intraocular Lenses.
abstract: OBJECTIVE
  To determine the effect of lens position and corneal curvature on the near focal point of different multifocal intraocular lenses.
  
  
  METHODS
  Near focal points for various multifocal intraocular lenses were calculated using a refractive vergence formula. Median, high, and low values for lens position and corneal curvature were used.
  
  
  RESULTS
  Lens position and corneal curvature both affected the theoretical near point of multifocal intraocular lenses. The effect was more pronounced for lower power adds. There was overlap of near focal points for the different near adds of the Tecnis multifocal lenses (AMO, Abbott Park, IL) across the range of lens positions and corneal curvatures seen in a normal population.
  
  
  CONCLUSIONS
  Clinicians need to be aware of the effect of lens position and corneal curvature on the near focal point of intraocular lenses.
authors.forename: Hamish D
authors.initials: HD
authors.lastname: McKee
authors.forename: Vishal
authors.initials: V
authors.lastname: Jhanji
mesh_terms: D015350:Contrast Sensitivity / Q000502:physiology; D003315:Cornea / Q000473:pathology*; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008962:Models, Theoretical; D055095:Optics and Photonics; D012029:Refraction, Ocular / Q000502:physiology; D014785:Vision, Ocular / Q000502:physiology