title: Dynamic vaulting changes in V4c versus V4 posterior chamber phakic lenses under differing lighting conditions.
abstract: OBJECTIVE
  To compare vaulting changes in eyes implanted with V4c and V4 implantable collamer lenses (ICLs) under differing lighting conditions.
  
  
  METHODS
  Noninterventional, cross-sectional comparative observational case series.
  
  
  METHODS
  Fifty-six eyes of 38 patients implanted with V4c ICLs, and 54 eyes of 28 patients implanted with V4 ICLs were enrolled and analyzed. Anterior chamber depth, pupil size and postoperative vaulting were evaluated using a Visante optical coherence tomography system under photopic and mesopic conditions 1 month postoperatively. Refractive errors, keratometry values, axial lengths, intraocular pressures, anterior chamber volumes, and central corneal thicknesses were also recorded.
  
  
  RESULTS
  No significant differences were noted in anterior chamber depth between photopic and mesopic conditions in either group. Significant decreases in vaulting and pupil size were detected under photopic conditions in both groups. Moreover, vaulting changes in eyes implanted with V4c ICLs were significantly larger than those in eyes implanted with V4 ICLs.
  
  
  CONCLUSIONS
  V4c ICL vaulting decreased more prominently under photopic conditions than did V4 ICL vaulting. Therefore, postoperative vaulting under mesopic and photopic conditions should be considered when interpreting the vaulting of eyes implanted with V4c ICLs.
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
authors.forename: Hun
authors.initials: H
authors.lastname: Lee
authors.affiliation: Eyereum Eye Clinic, Seoul, South Korea.
authors.forename: Sung Yong
authors.initials: SY
authors.lastname: Kang
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
authors.forename: Kyoung Yul
authors.initials: KY
authors.lastname: Seo
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
authors.forename: Byunghoon
authors.initials: B
authors.lastname: Chung
authors.affiliation: Eyereum Eye Clinic, Seoul, South Korea.
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Choi
authors.affiliation: Emory University School of Medicine, Atlanta, GA, USA.
authors.forename: Kyu Seo
authors.initials: KS
authors.lastname: Kim
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea. Electronic address: tikim@yuhs.ac.
authors.forename: Tae-Im
authors.initials: TI
authors.lastname: Kim
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000473:pathology*; D055253:Color Vision / Q000502:physiology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D032801:Iridectomy; D017075:Laser Coagulation; D053844:Lasers, Solid-State; D019654:Lens Implantation, Intraocular; D008027:Light; D008297:Male; D055255:Mesopic Vision / Q000502:physiology*; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011183:Postoperative Complications; D011680:Pupil / Q000502:physiology; D012189:Retrospective Studies; D014792:Visual Acuity; D055815:Young Adult