title: Long-term evaluation of the central vault after phakic Collamer® lens (ICL) implantation using OCT.
abstract: OBJECTIVE
  The aim of this work is to evaluate the changes in the central vault after using implantable Collamer® lenses (ICL) to correct myopia.
  
  
  METHODS
  This cohort study included 133 eyes; mean spherical equivalent -9.47 ± 3.71 diopters (D) (range: -2.75 to -22.25 D) who underwent ICL V4 implantation. Besides a complete ophthalmologic examination, the central vaulting was measured with Visante OCT and evaluated between different periods of follow-up (1 week, 1, 3, and 6 months, and yearly postoperatively). Post-operative time ranged from 6 to 73 months.
  
  
  RESULTS
  Within the first 6 months, the mean central vaulting dropped from 510 ± 238 μm (range 100 to 940 μm) to 439 ± 231 μm (range 90 to 910) a significant decrease by 71 ± 58 μm (range -170 to 30 μm) (p = 0.028) with a trend to a lower reduction after this period. After 36 month from ICL implantation, this variation tends to be smaller with the majority of the eyes having a mean decrease smaller than 2 μm per month. Initial vault (Spearman Rho = -0.237, p = 0.006) was the factor more significantly associated with decrease in vault; eyes presenting a reduction in vault >100 μm had an average initial vault that was 141 μm and 184 μm higher than eyes with no change or with increase in vault over time, respectively.
  
  
  CONCLUSIONS
  This study shows a continuous reduction of central vault over time. The reduction is highest during the first 6 months and tends to be lower and slow down over time. The decrease of vaulting was more pronounced in eyes with larger initial vaulting.
authors.affiliation: Fernández-Vega Ophthalmological Institute, Avda. Dres. Fernández-Vega 114, 33012, Oviedo, Spain. j.alfonso@fernandez-vega.com
authors.forename: Jose F
authors.initials: JF
authors.lastname: Alfonso
authors.forename: L
authors.initials: L
authors.lastname: Fernández-Vega
authors.forename: C
authors.initials: C
authors.lastname: Lisa
authors.forename: P
authors.initials: P
authors.lastname: Fernandes
authors.forename: J
authors.initials: J
authors.lastname: González-Meijome
authors.forename: R
authors.initials: R
authors.lastname: Montés-Micó
mesh_terms: D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011183:Postoperative Complications; D013997:Time Factors; D041623:Tomography, Optical Coherence; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult