title: Rotational stability of a single-piece toric acrylic intraocular lens.
abstract: OBJECTIVE
  To assess the rotational stability of a single-piece toric hydrophobic acrylic intraocular lens (IOL) during the first 6 postoperative months.
  
  
  METHODS
  Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom.
  
  
  METHODS
  Prospective case series.
  
  
  METHODS
  Eyes with age-related cataract and corneal astigmatism (1.00 to 3.00 D diopter [D]) were measured by partial coherence interferometry (IOLMaster). Preoperatively, the horizontal axis was marked. Surgical technique included a standardized temporal clear corneal incision, phacoemulsification, and in-the-bag implantation of a toric IOL (AcrySof SN60TT). Rotational stability of the IOL was assessed using retroillumination photographs postoperatively at 1 hour and at 1 and 6 months. Uncorrected (UDVA) and corrected distance visual acuities, residual refractive error, and keratometric and refractive cylinders were measured.
  
  
  RESULTS
  The study enrolled 30 eyes (30 patients). The mean absolute IOL rotation was 2.44 degrees ± 1.84 (SD) at 1 month and 2.66 ± 1.99 degrees at 6 months. The photographic technique had high reproducibility of axis measurement, with consecutive measurements varying by less than 2.0 degrees. The mean UDVA was 0.16 logMAR (range 0.42 to -0.18 logMAR) at 1 month and 0.20 logMAR (range 0.60 to -0.20 logMAR) at 6 months. The residual refractive cylinder by autorefraction was -0.84 D (range -2.00 to 0.00 D) and -0.80 D (range -1.75 to 0.00 D), respectively.
  
  
  CONCLUSIONS
  The acrylic toric IOL was rotationally stable within the first 6 months postoperatively. The photographic and axis analysis method to evaluate stability had high reproducibility and detected small changes in rotation.
authors.affiliation: Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom.
authors.forename: John J
authors.initials: JJ
authors.lastname: Koshy
authors.forename: Yutaro
authors.initials: Y
authors.lastname: Nishi
authors.forename: Nino
authors.initials: N
authors.lastname: Hirnschall
authors.forename: Alja
authors.initials: A
authors.lastname: Crnej
authors.forename: Vinod
authors.initials: V
authors.lastname: Gangwani
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Maurino
authors.forename: Oliver
authors.initials: O
authors.lastname: Findl
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000150:complications; D002386:Cataract / Q000150:complications; D005260:Female; D006801:Humans; D007368:Interferometry; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D010781:Photography / Q000379:methods; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D012399:Rotation; D014792:Visual Acuity / Q000502:physiology
chemical_list: D000180:Acrylic Resins