title: Observing implantable collamer lens dislocation by panoramic ultrasound biomicroscopy.
abstract: OBJECTIVE
  Observe the image characteristics and dislocation of implantable collamer lenses (ICL) following their use to correct high myopia.
  
  
  METHODS
  A total of 127 patients (242 eyes); 64 females (50.3%) and 63 males (49.7%) were included in this retrospective study with ICL V4 implantation and mean spherical equivalent -9.08±2.04 diopters (D). Panoramic ultrasound biomicroscopy (UBM) was utilized to observe anterior segment morphology and ICL location at various follow-up periods (1 week preoperative, followed by 1, 3, 6, and yearly postoperative).
  
  
  RESULTS
  Twenty-eight ICL eyes (11.2%) were noted to have abnormal postoperative positioning. The central vault of 12 eyes was too high with ICL decentration, mean central vault 1.14±0.39 mm; 10 eyes were too low but without ICL decentration, mean central vault 0.13±0.11 mm. The remaining subjects were only ICL decentration without abnormal central vault, mean central vault was 0.54±0.28 mm.
  
  
  CONCLUSIONS
  This study shows the abnormal characteristics regarding ICL locations. The ICL dislocation closely correlates with the central vault. The ICL dislocation is the primary cause of several postoperative complications. Panoramic UBM is one of the most effective imaging means to observe the ICL positioning and its stability after implantable surgery.
authors.affiliation: Department of Ophthalmology, The Fourth Affiliated Hospital of China Medical University, Eye Hospital of China Medical University, The Key Laboratory of Lens in Liaoning Province, Shenyang, China.
authors.forename: M
authors.initials: M
authors.lastname: Shi
authors.affiliation: Department of Ophthalmology, The Fourth Affiliated Hospital of China Medical University, Eye Hospital of China Medical University, The Key Laboratory of Lens in Liaoning Province, Shenyang, China.
authors.forename: J
authors.initials: J
authors.lastname: Kong
authors.affiliation: Department of Ophthalmology, The Fourth Affiliated Hospital of China Medical University, Eye Hospital of China Medical University, The Key Laboratory of Lens in Liaoning Province, Shenyang, China.
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Ophthalmology, The Fourth Affiliated Hospital of China Medical University, Eye Hospital of China Medical University, The Key Laboratory of Lens in Liaoning Province, Shenyang, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Yan
authors.affiliation: Department of Ophthalmology, The Fourth Affiliated Hospital of China Medical University, Eye Hospital of China Medical University, The Key Laboratory of Lens in Liaoning Province, Shenyang, China.
authors.forename: J
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D000869:Anterior Eye Segment / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular / Q000379:methods*; D008297:Male; D033401:Microscopy, Acoustic; D008875:Middle Aged; D047728:Myopia, Degenerative / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011475:Prosthesis Failure; D012189:Retrospective Studies; D014792:Visual Acuity; D055815:Young Adult