title: Comparison of surgically induced astigmatisms after clear corneal incisions of different sizes.
abstract: OBJECTIVE
  This study was performed to assess efficiency and stability of astigmatic change by incision size after cataract surgery.
  
  
  METHODS
  This work was designed as a retrospective, comparative, nonrandomized interventional study. A total of 121 cases of cataract surgery were reviewed in 98 patients performed by one surgeon at the Oregon Eye Institute in Eugene, OR, USA with 3-year follow-ups. All procedures were performed with the temporal approach of self-sealing incisions. The serial change in surgically induced astigmatisms were examined in all cases of three groups: Group A, cartridge injection of a foldable IOL through a 2.5 mm self-sealing incision; Group B, cartridge injection of a foldable IOL through a 3.0 mm self-sealing incision; Group C, cartridge injection of a foldable IOL through a 3.5 mm self-sealing incision. Keratometric data were obtained preoperatively, and 3 weeks, 3 months, 6 months, 9 months, 12 months, 24 months and 36 months postoperatively. Polar value analysis was performed to calculate the surgically induced astigmatism.
  
  
  RESULTS
  The astigmatic change decreased over time in Group B (P<0.05). The other groups tended to remain in induced astigmatism. All groups showed anticlockwise torque at 3 weeks following surgery. Group B showed a decrease in deviation, but the other groups showed increases in their torque value at postoperative 12 months (P<0.05).
  
  
  CONCLUSIONS
  The 3.0 mm incision size correlated with the least surgically induced astigmatism.
authors: Oregon Eye Institute, Eugene, Oregon 97401, USA. sungcmoon@hanmail.net
authors: Sung Chur
authors: SC
authors: Moon
authors: Tarek
authors: T
authors: Mohamed
authors: I Howard
authors: IH
authors: Fine
mesh_terms: D001251:Astigmatism / Q000209:etiology*; D002387:Cataract Extraction / Q000009:adverse effects* / Q000379:methods*; D003315:Cornea / Q000601:surgery*; D006801:Humans; D019654:Lens Implantation, Intraocular; D018918:Phacoemulsification; D012189:Retrospective Studies