title: Postoperative astigmatic outcomes based on the haptic axis of intraocular lenses inserted in cataract surgery.
abstract: OBJECTIVE
  This study was conducted to compare post-operative astigmatic outcomes of two groups, with-the-rule (WTR) and against-the-rule (ATR) astigmatism patients, according to the haptic axis of intraocular lenses (IOLs) inserted in cataract surgery.
  
  
  METHODS
  Seventy-two eyes with WTR astigmatism and 79 eyes with ATR astigmatism had cataract surgery through a clear corneal temporal incision. These two groups of eyes were then each divided into 2 groups based on whether the haptic axis of the inserted IOL was at 180° or 90°. For ATR patients, the outcomes were analyzed according to the three types of IOLs.
  
  
  RESULTS
  There was no difference in corneal astigmatism, but WTR patients with a 180° haptic axis of the inserted IOL and ATR patients with a 90° hepatic axis of the inserted IOL had a significant decrease in postoperative refractive astigmatism (p < 0.05). The changes in ATR astigmatism according to the IOL type were more effective in single-piece acrylic IOLs than in the three-piece polymethylmethacrylate haptic IOL group.
  
  
  CONCLUSIONS
  Insertion of the IOL at the 180° haptic axis in WTR patients and at 90° in ATR patients during cataract surgery may have an effect in reducing pre-existing astigmatism. This observed effect was not consistent among the different types of IOLs.
authors.affiliation: Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.
authors.forename: In-Tae
authors.initials: IT
authors.lastname: Kim
authors.forename: Hae-Young Lopilly
authors.initials: HY
authors.lastname: Park
authors.forename: Hyun-Seung
authors.initials: HS
authors.lastname: Kim
mesh_terms: D001251:Astigmatism / Q000145:classification / Q000209:etiology* / Q000503:physiopathology*; D002387:Cataract Extraction / Q000009:adverse effects*; D004867:Equipment Design; D006801:Humans; D019654:Lens Implantation, Intraocular / Q000379:methods*; D007910:Lenses, Intraocular; D011183:Postoperative Complications; D016896:Treatment Outcome