title: Digital system measurement of decentration of Worst-Fechner iris claw myopia intraocular lens.
abstract: BACKGROUND
  Topography measures the centration in refractive and corneal refractive surgery, but until recently there was no effective method to measure decentration in intraocular lens (IOL) implantation.
  
  
  METHODS
  We measured the decentration of 22 phakic eyes, in 14 high myopic patients, based upon photographs of the anterior segment using a digital analysis system (IMAGEnet Topcon Corporation 1988, Tokyo, Japan). These eyes had undergone IOL implantation for the correction of myopia with Worst-Fechner iris claw lenses. Decentration was measured with respect to the centers of both the cornea and pupil.
  
  
  RESULTS
  Mean decentration of the IOL center from the cornea center was 0.51 +/- 0.25 mm (range, 0 to 0.8374 mm). When measured with respect to the center of the pupil, the average decentration was 0.47 +/- 0.29 mm (range, 0.182 to 0.9341 mm). A positive correlation between the decentration measurements of the two methods was found (p < .01 indicated statistical significance).
  
  
  CONCLUSIONS
  This digital imaging system (IMAGEnet) accurately measured decentration of IOLs in myopic eyes.
authors.affiliation: Department of Ophthalmology, La Fe University Hospital, Valencia, Spain.
authors.forename: V T
authors.initials: VT
authors.lastname: Pérez-Torregrosa
authors.forename: J L
authors.initials: JL
authors.lastname: Menezo
authors.forename: M A
authors.initials: MA
authors.lastname: Harto
authors.forename: M J
authors.initials: MJ
authors.lastname: Maldonado
authors.forename: A
authors.initials: A
authors.lastname: Cisneros
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000601:surgery*; D003315:Cornea / Q000033:anatomy & histology; D005260:Female; D005548:Foreign-Body Migration / Q000175:diagnosis*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D055095:Optics and Photonics; D011680:Pupil