title: Determination of intraocular lens tilt and decentration using simple and rapid method.
abstract: OBJECTIVE
  To determine the tilt and decentration of implanted intraocular lens (IOL) in vivo one year postoperatively.
  
  
  METHODS
  A retrospective study was performed on 67 eyes by the method introduced by Guyton using the third and fourth Purkinje imagesm through undilated pupil.
  
  
  RESULTS
  The average decentration of implanted IOL was 0.68 mm, and the average tilt was 6.03 degrees. The result was similar to the histopathological study in postmortem eyes and the measurement in vivo. Linear-regression analysis showed there was no relationship between the tilt and decentration and the residual astigmatism, axial length, IOL power, etc.
  
  
  CONCLUSIONS
  The result is similar to the other methods. The method using the third and fourth Purkinje images is simple and easy to perform. It can be used for determining the IOL position through undilated pupil and does not require special apparatus.
authors.affiliation: Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou 510060, China.
authors.forename: M
authors.initials: M
authors.lastname: Wu
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: W
authors.initials: W
authors.lastname: Cheng
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000175:diagnosis / Q000209:etiology*; D002387:Cataract Extraction; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D012189:Retrospective Studies