title: Visual performance after toric IOL implantation in patients with corneal astigmatism.
abstract: OBJECTIVE
  To analyze visual acuity without correction and rotational stability outcomes following toric IOL implantation.
  
  
  METHODS
  Prospective study of 20 eyes of 13 patients that underwent phacoemulsification surgery indicated for cataract associated with regular keratomeric astigmatism, symmetrical, ranging from 1 to 4 diopters. Best corrected visual acuity, refraction, keratometry and computed topography were performed preoperatively. The calculation of cylindrical lens power and its placement were determined by the manufacturer. All lenses were implanted in the capsular bag by the same surgeon. The patients were examined by a second independent observer, at 1st, 10th, 20th, 30th, and 60th postoperative day.
  
  
  RESULTS
  Visual acuity without correction ranged between 20/15 and 20/40. One eye achieved 20/15 (5%), 4 eyes 20/20 (20%), 6 eyes 20/25 (30%), 7 eyes 20/30 (35%) and 2 eyes 20/40 (10%). Best corrected visual acuity ranged between 20/15 and 20/40; two eyes with 20/15 (10%), 9 eyes 20/20 (45%), 7 eyes 20/25 (35%), 1 eye 20/30 (5%) and 1 eye 20/40 (5%). It is important to remember that the average spherical refraction was -0.05 SD (ranging from -0.50 to +0.75 SD). The mean cylindrical refraction was -0.63 CD ranging from -0.50 to -1.25 CD. The IOL rotation in this study had an average of 3.2 masculine to 30 masculine, ranging from 0 masculine of rotation to a maximum of 13 masculine; 7 lenses (35%) suffered no rotation, 9 lenses (45%) suffered rotation between 1 masculine to 5 masculine, 3 lenses (15%) had rotation between 6 masculine to 10 masculine, and ultimately 1 lens (5%) had rotation between 11 masculine to 15 masculine. There was no significant rotation after the 30th postoperative day.
  
  
  CONCLUSIONS
  The average of rotation of the IOL was 3.2 masculine, where 95% of IOLs presented rotation less than or equal to 10 masculine what means a very good rotational stability. In daily practice, a good visual acuity is directly related to IOL rotational stability and refractive predictability.
authors.affiliation: Hospital de Olhos do Paraná, Curitiba, PR, Brasil.
authors.forename: Renato José Bett
authors.initials: RJ
authors.lastname: Correia
authors.forename: Hamilton
authors.initials: H
authors.lastname: Moreira
authors.forename: Sólon Uchoa Lago
authors.initials: SU
authors.lastname: Netto
authors.forename: Gleisson Rezende
authors.initials: GR
authors.lastname: Pantaleão
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000601:surgery*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D011184:Postoperative Period; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D012399:Rotation; D013997:Time Factors; D014792:Visual Acuity / Q000502:physiology*