title: One year follow-up of astigmatism after 4.0 mm temporal clear corneal and superior scleral incisions.
abstract: OBJECTIVE
  To compare the effect of 2 contemporary sutureless cataract surgery incisions on corneal astigmatism 1 year after surgery.
  
  
  METHODS
  Outpatient Clinic, Department of Ophthalmology, Vejle Hospital, Denmark.
  
  
  METHODS
  Sixty-nine patients who had cataract surgery in 1997 with a 4.0 mm temporal clear corneal (n = 32) or superior scleral (n = 37) incision were examined 1 year postoperatively. Surgically induced astigmatism was analyzed by vector analysis, vector decomposition, and polar values using preoperative and postoperative keratometric readings.
  
  
  RESULTS
  Vector analysis revealed a slightly lower median induced cylinder in the clear corneal patients; 0.41 diopter (D) (95% confidence limits [CL] 0.24 to 0.67 D) versus 0.61 D (95% CL 0.49 to 0.73 D) (P < .05). Decomposition of the induced cylinder (against the rule/total) showed statistically significant differences in the direction of the cylinder; 0.21 (95% CL 0.03 to 0.41) versus 0.90 (95% CL 0.82 to 0.95) (P < .00001). The directional difference was confirmed by polar values.
  
  
  CONCLUSIONS
  Both incisions induced low and comparable amounts of astigmatism. The directional differences were modest. Findings in previous studies of a poor outcome after clear corneal incisions were not confirmed in this long-term follow-up.
authors.affiliation: Department of Ophthalmology, Vejle Hospital, Denmark.
authors.forename: N
authors.initials: N
authors.lastname: Lyhne
authors.forename: J
authors.initials: J
authors.lastname: Krogsager
authors.forename: L
authors.initials: L
authors.lastname: Corydon
authors.forename: M
authors.initials: M
authors.lastname: Kjeldgaard
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000209:etiology / Q000503:physiopathology*; D002387:Cataract Extraction / Q000009:adverse effects*; D003315:Cornea / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D012029:Refraction, Ocular; D012189:Retrospective Studies; D012590:Sclera / Q000601:surgery*; D016896:Treatment Outcome