title: Comparison of surgically induced astigmatism between femtosecond laser and manual clear corneal incisions for cataract surgery.
abstract: OBJECTIVE
  To assess the surgically induced corneal astigmatism (SIA) introduced by femtosecond laser-assisted clear corneal incisions (CCIs) for cataract extraction and to compare it with the SIA of manually created CCIs.
  
  
  METHODS
  Bascom Palmer Eye Institute, Miller School of Medicine, Miami, Florida, USA.
  
  
  METHODS
  Prospective nonrandomized comparative case series.
  
  
  METHODS
  Eyes received femtosecond laser-assisted CCIs (Group 1) or manual CCIs (Group 2). The surgical plan included 1 primary and 1 secondary port; the sites of the incisions were the same in both groups and were diametrically opposed between the right eye and left eye. The SIA was assessed using the preoperative and 1-month postoperative keratometric values obtained from corneal topography examinations.
  
  
  RESULTS
  This study included 72 eyes of 68 patients with a mean age of 69.0 years ± 9.87 (SD) (range 36 to 90 years). Thirty-six eyes received femtosecond laser-assisted CCIs (Group 1) and 36 received manual CCIs (Group 2). The mean preoperative topographic corneal astigmatism was -1.19 ± 0.68 diopters (D) (range 0 to 2.50 D) and -0.92 ± 0.63 D (range 0.10 to 2.45 D) for Group 1 and Group 2, respectively, whereas, 1 month after cataract surgery, it was -1.16 ± 0.63 D (range 0.20 to 2.57 D) and -0.95 ± 0.64 D (range 0.21 to 2.37 D), respectively. Multivariate vector analysis revealed no statistically significant difference between the 2 groups for preoperative astigmatism, postoperative astigmatism, and SIA (P > .05 for all comparisons between Group 1 and Group 2).
  
  
  CONCLUSIONS
  Femtosecond laser-assisted and manual corneal incisions for cataract surgery did not appear to significantly alter corneal astigmatism, whereas they showed comparable SIA.
  
  
  BACKGROUND
  Drs. Yoo and Donaldson are speakers for and consultants to Alcon Surgical, Inc., and Abbott Medical Optics, Inc. No other author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA. Electronic address: diakonis@gmail.com.
authors.forename: Vasilios F
authors.initials: VF
authors.lastname: Diakonis
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Nilufer
authors.initials: N
authors.lastname: Yesilirmak
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Florence
authors.initials: F
authors.lastname: Cabot
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Vardhaman P
authors.initials: VP
authors.lastname: Kankariya
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: George A
authors.initials: GA
authors.lastname: Kounis
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Warren
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Ibrahim O
authors.initials: IO
authors.lastname: Sayed-Ahmed
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Sonia H
authors.initials: SH
authors.lastname: Yoo
authors.affiliation: From the Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, USA.
authors.forename: Kendall
authors.initials: K
authors.lastname: Donaldson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D003315:Cornea / Q000503:physiopathology / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification / Q000009:adverse effects*; D011446:Prospective Studies; D054140:Refractive Surgical Procedures / Q000009:adverse effects*; D014792:Visual Acuity / Q000502:physiology