Intraocular lens movement caused by ciliary muscle contraction

J Cataract Refract Surg. 2003 Apr;29(4):669-76. doi: 10.1016/s0886-3350(02)01652-8.


Purpose: To investigate intraocular lens (IOL) movement, measured as a change in anterior chamber depth (ACD) caused by pilocarpine-induced ciliary muscle contraction.

Setting: 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.

MeSH terms

  • Accommodation, Ocular / physiology*
  • Aged
  • Aged, 80 and over
  • Anterior Chamber / diagnostic imaging
  • Anterior Chamber / physiology
  • Capsulorhexis
  • Ciliary Body / diagnostic imaging
  • Ciliary Body / physiology*
  • Cyclopentolate / pharmacology
  • Humans
  • Interferometry
  • Lens Implantation, Intraocular
  • Lenses, Intraocular*
  • Light
  • Middle Aged
  • Muscle Contraction / drug effects
  • Muscle Contraction / physiology*
  • Muscle, Smooth / diagnostic imaging
  • Muscle, Smooth / physiology*
  • Parasympatholytics / pharmacology
  • Phacoemulsification
  • Pilocarpine / pharmacology
  • Prospective Studies
  • Pseudophakia / diagnostic imaging
  • Pseudophakia / physiopathology*
  • Tomography
  • Ultrasonography


  • Parasympatholytics
  • Pilocarpine
  • Cyclopentolate