title: Collagen copolymer toric phakic intraocular lens for myopic astigmatism: one-year follow-up.
abstract: OBJECTIVE
  To assess the predictability, stability, safety, and efficacy of a collagen copolymer toric phakic intraocular lens (pIOL) to correct moderate and high astigmatism.
  
  
  METHODS
  Fernández-Vega Ophthalmological Institute, Oviedo, Spain.
  
  
  METHODS
  Case series.
  
  
  METHODS
  After implantation of the TV4b toric Implantable Collamer Lens pIOL, the uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, toric pIOL vault, and adverse effects were evaluated over 12 months.
  
  
  RESULTS
  The study enrolled 35 eyes of 20 patients with a mean sphere of -5.46 diopters (D) ± 4.17 (SD) and mean cylinder of -3.14 ± 1.19 D. At 12 months, the mean sphere was -0.04 ± 0.16 D, with 97% of eyes being within ±0.50 D of the target (r(2) = 0.99), and the mean cylinder was -0.29 ± 0.42 D. For the astigmatism components, 80% of eyes were within ±0.25 D of both J0 (r(2) = 0.99) and J45 (r(2) = 0.99). The mean decimal UDVA was 0.89 ± 0.16 and the mean decimal CDVA, 0.95 ± 0.12. No eye lost lines of CDVA, and 43% of eyes gained 1 or more lines. The safety index was 1.08 at 12 months. More than 50% of eyes had a Snellen UDVA of 20/20. The efficacy index was 0.97 at 3 months and 1.01 at 12 months.
  
  
  CONCLUSIONS
  The visual and refractive outcomes were good and highly stable throughout the follow-up, indicating that this toric pIOL model is predictable, safe, and effective in correcting low and high levels of astigmatism.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors: From the Fernández-Vega Ophthalmological Institute (Alfonso, Lisa), and the Surgery Department (Alfonso), School of Medicine, University of Oviedo, Oviedo, the Department of Ophthalmology (Alfonso-Bartolozzi), Clínica Universidad de Navarra, Pamplona, and the Optics Department (Pérez-Vives, Montés-Micó), Faculty of Physics, University of Valencia, Valencia, Spain. Electronic address: j.alfonso@fernandez-vega.com.
authors: José F
authors: JF
authors: Alfonso
authors: From the Fernández-Vega Ophthalmological Institute (Alfonso, Lisa), and the Surgery Department (Alfonso), School of Medicine, University of Oviedo, Oviedo, the Department of Ophthalmology (Alfonso-Bartolozzi), Clínica Universidad de Navarra, Pamplona, and the Optics Department (Pérez-Vives, Montés-Micó), Faculty of Physics, University of Valencia, Valencia, Spain.
authors: Carlos
authors: C
authors: Lisa
authors: From the Fernández-Vega Ophthalmological Institute (Alfonso, Lisa), and the Surgery Department (Alfonso), School of Medicine, University of Oviedo, Oviedo, the Department of Ophthalmology (Alfonso-Bartolozzi), Clínica Universidad de Navarra, Pamplona, and the Optics Department (Pérez-Vives, Montés-Micó), Faculty of Physics, University of Valencia, Valencia, Spain.
authors: Belén
authors: B
authors: Alfonso-Bartolozzi
authors: From the Fernández-Vega Ophthalmological Institute (Alfonso, Lisa), and the Surgery Department (Alfonso), School of Medicine, University of Oviedo, Oviedo, the Department of Ophthalmology (Alfonso-Bartolozzi), Clínica Universidad de Navarra, Pamplona, and the Optics Department (Pérez-Vives, Montés-Micó), Faculty of Physics, University of Valencia, Valencia, Spain.
authors: Cari
authors: C
authors: Pérez-Vives
authors: From the Fernández-Vega Ophthalmological Institute (Alfonso, Lisa), and the Surgery Department (Alfonso), School of Medicine, University of Oviedo, Oviedo, the Department of Ophthalmology (Alfonso-Bartolozzi), Clínica Universidad de Navarra, Pamplona, and the Optics Department (Pérez-Vives, Montés-Micó), Faculty of Physics, University of Valencia, Valencia, Spain.
authors: Robert
authors: R
authors: Montés-Micó
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D003094:Collagen; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D054120:Phakic Intraocular Lenses; D011108:Polymers; D011446:Prospective Studies; D011474:Prosthesis Design; D012029:Refraction, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult
chemical_list: D011108:Polymers; D003094:Collagen