title: Decentration of 3-piece versus plate-haptic silicone intraocular lenses.
abstract: OBJECTIVE
  To compare the incidence of decentration with 2 types of silicone intraocular lenses (IOLs).
  
  
  METHODS
  John A. Moran Eye Center, University of Utah Medical Center, Salt Lake City, Utah, USA.
  
  
  METHODS
  Selection criteria for this retrospective study included patients who had uncomplicated cataract surgery with a clear cornea or scleral tunnel incision with a curvilinear capsulorhexis and capsular bag implantation of a silicone IOL. After a mean follow-up of 14 months (range 12 to 18 months), 54 eyes implanted with a 3-piece lens (AMO SI-30) and 58 eyes implanted with a plate-haptic lens (Staar AA403) were examined for posterior chamber IOL decentration. The decentration criterion was 0.5 mm or more from the center of the pupil. Detailed chart review of preoperative and postoperative measurements was performed for each patient.
  
  
  RESULTS
  Eighteen of the 3-piece IOLs (33%) and 11 of the plate-haptic IOLs (20%) were decentered 0.5 mm or more (P = .129). Using photographic analysis, the mean IOL decentration with the 3-piece IOL (1.12 mm +/- 0.198 [SD]) was significantly greater than with the plate-haptic IOL (0.632 +/- 0.278 mm)(P < .001). No statistically significant correlation was found between the centered or decentered IOL groups' preoperative refraction, axial length, capsulorhexis size, type of incision, or rate of neodymium:YAG laser capsulotomy.
  
  
  CONCLUSIONS
  No statistically significant difference was seen between the decentration rates of 3-piece and plate-hepatic IOLs; however, the amount of decentration with the 3-piece IOL was significantly greater than with the plate-hepatic IOL. Other factors did not contribute to IOL decentration.
authors.affiliation: Department of Ophthalmology, John A. Moran Eye Center, Salt Lake City, Utah 84132, USA.
authors.forename: I P
authors.initials: IP
authors.lastname: Hwang
authors.forename: T E
authors.initials: TE
authors.lastname: Clinch
authors.forename: M
authors.initials: M
authors.lastname: Moshifar
authors.forename: L
authors.initials: L
authors.lastname: Malmquist
authors.forename: M
authors.initials: M
authors.lastname: Cason
authors.forename: A S
authors.initials: AS
authors.lastname: Crandall
mesh_terms: D005500:Follow-Up Studies; D005548:Foreign-Body Migration / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D015994:Incidence; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification / Q000009:adverse effects*; D011474:Prosthesis Design; D012189:Retrospective Studies; D012826:Silicone Elastomers; D014589:Utah / Q000453:epidemiology
chemical_list: D012826:Silicone Elastomers