title: Myopic phakic STAAR collamer posterior chamber intraocular lenses for keratoconus.
abstract: To evaluate the efficacy, predictability, and safety of myopic phakic posterior chamber Implantable Collamer Lens (ICL) to correct myopia associated with keratoconus.
  
  
  
  In a prospective, noncomparative, interventional case series, outcomes in 25 consecutive keratoconus eyes of 16 patients, myopia from -3.00 to -18.00 diopters (D) and astigmatism from -0.50 to -3.00 D, were analyzed 12 months after implantation of myopic ICLs (STAAR Surgical). All eyes showed best spectacle-corrected visual acuity (BSCVA) > or =20/50, central keratometric values < or =52.00 D, and refractive cylinder < or =3.00 D. Myopic ICL implantation was performed through a corneal incision in the steepest meridian.
  
  
  
  The mean uncorrected visual acuity and BSCVA after ICL implantation were 0.17+/-0.19 and 0.12+/-0.12 logMAR, respectively. The efficacy index was 0.98. No eyes lost 2 or more lines of visual acuity, 2 eyes lost 1 line, 18 eyes did not change after surgery, and 5 eyes gained 1 or more lines. The safety index was 1.05. Best spectacle-corrected visual acuity after ICL implantation was statistically significantly better than preoperative BSCVA (P=.0021). Spherical equivalent refraction was within +/-1.00 D of the desired refraction in all cases and 84% of cases were within +/-0.50 D. Mean postoperative spherical equivalent refraction was 0.32+/-0.55 D at 12 months.
  
  
  
  Myopic ICL implantation was a safe, effective, and predictable procedure for the correction of myopia associated with keratoconus.
authors.affiliation: Fernández-Vega Ophthalmological Institute, Oviedo, Spain. j.alfonso@fernandez-vega.com
authors.forename: José F
authors.initials: JF
authors.lastname: Alfonso
authors.forename: Ana
authors.initials: A
authors.lastname: Palacios
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
mesh_terms: D000328:Adult; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000503:physiopathology / Q000601:surgery*; D019654:Lens Implantation, Intraocular / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology