title: Effect of intraocular lens asphericity on quality of vision after cataract removal: an intraindividual comparison.
abstract: OBJECTIVE
  To determine the effect of intraocular lens (IOL) asphericity on quality of vision after cataract removal.
  
  
  METHODS
  Intraindividual, prospective, randomized clinical trial.
  
  
  METHODS
  Twenty-six cataract patients received 2, one-piece, blue-light-filtering hydrophobic acrylic IOLs each.
  
  
  METHODS
  One eye was implanted with a spherical (SN60AT, Alcon) and the contralateral eye with an aspheric (SN60WF, Alcon) IOL with -0.2 mum spherical aberration (SA). All trial-specific measurements (corneal topography, wavefront sensing, high-contrast visual acuity [HCVA], contrast sensitivity [CS]) were performed 6 months after surgery. A paired Student t-test or Wilcoxon test was used to check intergroup differences.
  
  
  METHODS
  Absolute values and intraindividual differences (Delta(i)) of corneal and ocular higher order aberrations and best-corrected visual Strehl ratio based on the optical transfer function (BCVSOTF) values for virtual pupil diameters of 3, 4, 5, and 6 mm were computed. Photopic and mesopic HCVA, photopic, and high-mesopic CS as well as high-mesopic disability glare (DG) were measured using the Frankfurt-Freiburg Contrast and Acuity Test System.
  
  
  RESULTS
  No intergroup difference of demographic data, pupillometry, and corneal aberrations were observed. Coma and trefoil root mean square and SA were significantly lower in the aspheric group resulting in higher BCVSOTF, mesopic HCVA, and photopic and high mesopic CS. All Delta(i) values with exception of photopic HCVA and DG indicated significantly better performance of the aspheric IOL.
  
  
  CONCLUSIONS
  An aspheric IOL with -0.2 microm SA provide higher quality of vision than spherical IOL in terms of retinal image quality, mesopic HCVA and CS.
  
  
  BACKGROUND
  Proprietary or commercial disclosures may be found after the references.
authors: Department of Ophthalmology, Johann Wolfgang Goethe-University, Theodor-Stern-Kai 7, Frankfurt am Main, Germany. Kohnen@em.uni-frankfurt.de
authors: Thomas
authors: T
authors: Kohnen
authors: Oliver K
authors: OK
authors: Klaproth
authors: Jens
authors: J
authors: Bühren
mesh_terms: D000368:Aged; D002386:Cataract / Q000150:complications; D015350:Contrast Sensitivity / Q000502:physiology; D019781:Corneal Topography; D005260:Female; D019466:Glare; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D055095:Optics and Photonics; D018918:Phacoemulsification; D011446:Prospective Studies; D011680:Pupil / Q000502:physiology; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology