Comparison of surgically induced astigmatism between femtosecond laser and manual clear corneal incisions for cataract surgery

Vasilios F. Diakonis, Nilufer Yesilirmak, Florence Cabot, Vardhaman P. Kankariya, George A. Kounis, Daniel Warren, Ibrahim O. Sayed-Ahmed, Sonia H Yoo, Kendall Donaldson

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Purpose 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. Setting Bascom Palmer Eye Institute, Miller School of Medicine, Miami, Florida, USA. Design 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). Conclusion Femtosecond laser-assisted and manual corneal incisions for cataract surgery did not appear to significantly alter corneal astigmatism, whereas they showed comparable SIA. Financial Disclosure 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.

Original languageEnglish (US)
Pages (from-to)2075-2080
Number of pages6
JournalJournal of Cataract and Refractive Surgery
Issue number10
StatePublished - Oct 1 2015

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Surgery


Dive into the research topics of 'Comparison of surgically induced astigmatism between femtosecond laser and manual clear corneal incisions for cataract surgery'. Together they form a unique fingerprint.

Cite this