title: Hypermotility of an iris-fixated anterior chamber phakic intraocular lens due to nontraumatic iris laxity.
abstract: OBJECTIVE
  Permanent immovability of phakic intraocular lenses (pIOLs) for the correction of high myopia is crucial in avoiding injury to the corneal endothelium and maintaining visual acuity. Unstable position of iris-fixated pIOLs due to traumatic or nontraumatic disenclavation of the haptic has been described previously.
  
  
  RESULTS
  We report a different mechanism of repeated excessive implant motility in both eyes of a young woman who developed late nontraumatic elongation of the iris fibers to which an iris-claw pIOL was fixated. This led to increased motility of the pIOLs with blinking causing mild iritis. Subsequent bilateral successful re-enclavation to other iris fibers ameliorated these symptoms. After 2.5 years, these iris fibers, too, were elongated, causing excessive movements of the pIOLs and consecutive endothelial cell loss necessitating removal of the pIOLs. The etiology of this iris fiber laxity remains unclear.
  
  
  CONCLUSIONS
  Surgeons should be aware of this rare potential complication.
authors.affiliation: Center for Refractive Surgery, Eye Department, St Francis Hospital, Münster, Germany. taneri@refraktives-zentrum.de
authors.forename: Suphi
authors.initials: S
authors.lastname: Taneri
authors.forename: Saskia
authors.initials: S
authors.lastname: Oehler
authors.forename: Jörg M
authors.initials: JM
authors.lastname: Koch
authors.forename: Arnd
authors.initials: A
authors.lastname: Heiligenhaus
mesh_terms: D000328:Adult; D003263:Contact Lenses, Hydrophilic; D020878:Device Removal; D005260:Female; D006801:Humans; D007498:Iris / Q000601:surgery*; D007499:Iris Diseases / Q000209:etiology*; D019654:Lens Implantation, Intraocular / Q000379:methods; D009123:Muscle Hypotonia / Q000209:etiology*; D047728:Myopia, Degenerative / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011183:Postoperative Complications; D011475:Prosthesis Failure