title: Change in efficiency of aspheric intraocular lenses based on pupil diameter.
abstract: OBJECTIVE
  To measure the effect of spherical aberration correction by aspheric intraocular lenses (IOLs) based on pupil diameter, and to determine the minimum pupil diameter for each aspheric IOL.
  
  
  METHODS
  Retrospective cross-sectional study.
  
  
  METHODS
  Eight-six patients (169 eyes) who were implanted with a HOYA AF-1 NY-60 (HOYA Corporation) or Tecnis ZCB00 1-piece IOL (Abbott Medical Optics Inc) were enrolled. Ocular, corneal, and internal spherical aberrations were measured at the 1-month postoperative visit using the Wavefront Analyzer KR-1W (Topcon). Minimum pupil diameter, which is required for each aspheric IOL to be effective, was calculated using a regression equation.
  
  
  RESULTS
  The mean value of internal spherical aberration of the Tecnis ZCB00 group (-0.09 ± 0.094 μm) was lower than that of the HOYA NY-60 group (-0.05 ± 0.072 μm) (P = .005). The original negative spherical aberrations of the HOYA NY-60 (-0.18 μm) were measured at a pupil diameter of 5.6 mm, and for the Tecnis ZCB00 (-0.27 μm) at a pupil diameter of 6.1 mm. The aspheric IOL efficiency dropped to 0% when the pupil diameter was 3.47 mm for the Tecnis ZCB00 group and 3.71 mm for the HOYA NY-60 group.
  
  
  CONCLUSIONS
  When the pupil diameters of patients are smaller than 3.4 mm for the Tecnis ZCB00 and 3.7 mm for the HOYA NY-60, the spherical aberration correction using these aspheric IOLs seems to be ineffective. Approximately 10% of the eyes showed smaller pupil size than the minimum effective diameter under mesopic conditions.
authors.affiliation: Department of Ophthalmology, Korea University College of Medicine, Seoul, Republic of Korea.
authors.forename: Youngsub
authors.initials: Y
authors.lastname: Eom
authors.forename: Eunjoo
authors.initials: E
authors.lastname: Yoo
authors.forename: Su-Yeon
authors.initials: SY
authors.lastname: Kang
authors.forename: Hyo-Myung
authors.initials: HM
authors.lastname: Kim
authors.forename: Jong-Suk
authors.initials: JS
authors.lastname: Song
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D057108:Corneal Wavefront Aberration / Q000503:physiopathology* / Q000601:surgery; D003362:Cost-Benefit Analysis; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D011474:Prosthesis Design; D011680:Pupil / Q000502:physiology*; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology