title: Ultrasound biomicroscopy examination of posterior chamber phakic intraocular lens position.
abstract: OBJECTIVE
  To better elucidate the in vivo position of the Collamer posterior chamber phakic intraocular lens (PCPIOL) and its relationship to the iris and the crystalline lens and to analyze possible variations over time.
  
  
  METHODS
  Prospective observational case series.
  
  
  METHODS
  Eighteen eyes of nine patients were included.
  
  
  METHODS
  A Staar Collamer implantable PCPIOL was implanted for the correction of high myopia.
  
  
  METHODS
  The eyes were studied with a 50-MHz ultrasound biomicroscopy UBM 840. The exact PCPIOL position and the distances between it and the crystalline lens were measured at 3, 6, and 12 months after surgery.
  
  
  RESULTS
  There were no intraoperative complications. In 13 eyes (72.22%), contact between the PCPIOL and the crystalline lens was found at some time during follow-up. In 3 eyes (16.6%), central contact could be demonstrated. We also observed that the contact zone and its extension can vary over time. In 2 eyes, rotation of the lens was observed.
  
  
  CONCLUSIONS
  We found contact between the PCPIOL and the crystalline lens in a high percentage of cases. There was also mobility of the lens in the posterior chamber, especially in the anteroposterior plane, and, as a consequence, both the contact zone and its extension would vary over time.
authors.affiliation: Instituto de Investigaciones Oftalmológicas Ramón Castroviejo, Hospital Clínico San Carlos, Universidad Complutense de Madrid, Madrid, Spain. Fundación Jiménez Díaz, Madrid, Spain.
authors.forename: Julián
authors.initials: J
authors.lastname: García-Feijoó
authors.forename: Iñigo Jiménez
authors.initials: IJ
authors.lastname: Alfaro
authors.forename: Ricardo
authors.initials: R
authors.lastname: Cuiña-Sardiña
authors.forename: Carmen
authors.initials: C
authors.lastname: Méndez-Hernandez
authors.forename: José Manuel Benítez
authors.initials: JM
authors.lastname: Del Castillo
authors.forename: Julián
authors.initials: J
authors.lastname: García-Sánchez
mesh_terms: D000328:Adult; D002924:Ciliary Body / Q000000981:diagnostic imaging; D005129:Eye Foreign Bodies / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007498:Iris / Q000000981:diagnostic imaging*; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000000981:diagnostic imaging*; D007910:Lenses, Intraocular; D008297:Male; D009216:Myopia / Q000601:surgery; D011446:Prospective Studies; D014463:Ultrasonography