title: Long-term ultrasound biomicroscopy observation of position changes of a copolymer posterior chamber phakic intraocular lens.
abstract: OBJECTIVE
  To evaluate longitudinal changes in Implantable Collamer Lens phakic intraocular lens (pIOL) position after implantation.
  
  
  METHODS
  Department of Ophthalmology, Zhejiang University, Hangzhou, China.
  
  
  METHODS
  Retrospective case series.
  
  
  METHODS
  Myopic eyes that had pIOL implantation with a follow-up of at least 24 months were evaluated. Ultrasound biomicroscopy examinations were performed at each visit.
  
  
  RESULTS
  The study enrolled 62 eyes (31 patients; 22 women, 9 men) ranging in age from 21 to 46 years. The manifest spherical equivalent ranged from -8.25 to -18.75 diopters. A significant increase (mean 36 μm±50 [SD]) in the endothelium-anterior pIOL distance occurred between 1 month and 3 months (P=.000); afterward, the distance decreased slowly (P>.05). The largest decrease (mean 47±17 μm) in central vault occurred between 1 month and 3 months (P=.009). The largest decrease (mean 21±14 μm) in peripheral vault occurred between 1 month and 3 months (P=.000).
  
  
  CONCLUSIONS
  A significant increase in the endothelium-anterior pIOL distance occurred from 1 month to 3 months postoperatively, after which a slight decrease occurred over time. Central vault and peripheral vault had a tendency to decrease over time.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China. Electronic address: idrshen@zju.edu.cn.
authors.forename: Xinfang
authors.initials: X
authors.lastname: Cao
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: Jianping
authors.initials: J
authors.lastname: Tong
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: Tian'an
authors.initials: T
authors.lastname: Zhou
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: Bei
authors.initials: B
authors.lastname: Ye
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: Xiuyi
authors.initials: X
authors.lastname: Li
authors.affiliation: From the Department of Ophthalmology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Shen
mesh_terms: D000328:Adult; D000869:Anterior Eye Segment / Q000000981:diagnostic imaging*; D060437:Artificial Lens Implant Migration / Q000000981:diagnostic imaging*; D019781:Corneal Topography; D004728:Endothelium, Corneal / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D033401:Microscopy, Acoustic; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011108:Polymers; D012029:Refraction, Ocular; D014792:Visual Acuity; D055815:Young Adult
chemical_list: D011108:Polymers