title: Intraocular lens movement caused by ciliary muscle contraction.
abstract: OBJECTIVE
  To investigate intraocular lens (IOL) movement, measured as a change in anterior chamber depth (ACD) caused by pilocarpine-induced ciliary muscle contraction.
  
  
  METHODS
  Department of Ophthalmology, University of Vienna, Vienna, Austria.
  
  
  METHODS
  In this prospective study, the ACD was measured using high-precision, high-resolution, dual-beam partial coherence interferometry in 62 pseudophakic eyes of 55 patients under pilocarpine- and cyclopentolate-induced ciliary muscle contraction and relaxation. The following were studied: 2 models of a ring-haptic IOL (designed to accommodate), a plate-haptic IOL, and 3 types of 3-piece IOLs. Measurements were performed 3 months after surgery.
  
  
  RESULTS
  The ring-haptic IOLs and plate-haptic IOL showed a forward movement (ring haptic 43A, -116 microm; ring haptic 43E, -222 microm; plate haptic -162 microm). The 3-piece IOLs showed no change in ACD except in 1 IOL type in which there was backward movement (156 microm).
  
  
  CONCLUSIONS
  Pilocarpine-induced ciliary muscle contraction caused forward movement of ring- and plate-haptic IOLs that resulted in an estimated accommodative amplitude of less than 0.50 diopter in most cases. The accommodating ring-haptic IOLs did not perform better than the conventional plate-haptic IOL.
authors.affiliation: Department of Ophthalmology, University of Vienna, Austria. oliver.findl@akh-wien.ac.at
authors.forename: Oliver
authors.initials: O
authors.lastname: Findl
authors.forename: Barbara
authors.initials: B
authors.lastname: Kiss
authors.forename: Vanessa
authors.initials: V
authors.lastname: Petternel
authors.forename: Rupert
authors.initials: R
authors.lastname: Menapace
authors.forename: Michael
authors.initials: M
authors.lastname: Georgopoulos
authors.forename: Georg
authors.initials: G
authors.lastname: Rainer
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Drexler
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000000981:diagnostic imaging / Q000502:physiology; D019923:Capsulorhexis; D002924:Ciliary Body / Q000000981:diagnostic imaging / Q000502:physiology*; D003519:Cyclopentolate / Q000494:pharmacology; D006801:Humans; D007368:Interferometry; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008027:Light; D008875:Middle Aged; D009119:Muscle Contraction / Q000187:drug effects / Q000502:physiology*; D009130:Muscle, Smooth / Q000000981:diagnostic imaging / Q000502:physiology*; D010276:Parasympatholytics / Q000494:pharmacology; D018918:Phacoemulsification; D010862:Pilocarpine / Q000494:pharmacology; D011446:Prospective Studies; D019591:Pseudophakia / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014054:Tomography; D014463:Ultrasonography
chemical_list: D010276:Parasympatholytics; D010862:Pilocarpine; D003519:Cyclopentolate