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Comparison of femtosecond laser versus surgeon-induced astigmatism during the creation of clear corneal incisions for cataract surgery

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Session Details

Session Title: Presented Poster Session: FLACS

Session Date/Time: Monday 07/09/2015 | 15:00-16:30

Paper Time: 15:10

Venue: Poster Village: Pod 1

First Author: : V.Diakonis USA

Co Author(s): :    N. Yesilirmak   F. Cabot   G. Kounis   D. Warren   S. Yoo   K. Donaldson

Abstract Details


To assess the surgically induced corneal astigmatism (SIA) introduced by femtosecond-assisted clear corneal incisions (CCI) for cataract extraction and to compare it with SIA of manually created CCI.


Bascom Palmer Eye Institute, Miller School of Medicine, Miami, Florida, USA.


This prospective comparative study, included 72 eyes of 68 patients, aged 69.0 ± 9.87 years (range, 36 – 90 years) undergoing cataract extraction. Thirty-six eyes received femtosecond-assisted CCIs (group 1) and 36 received manual CCIs (group 2). The surgical plan included one primary and one secondary port; the sites of the incisions were the same in both groups and were diametrically opposed between the right and left eyes undergoing surgery. SIA was assessed using the pre- and one month post- operative keratometric values, which were obtained from corneal topography examination. Multivariete vector analysis was performed to assess astogmatism.


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 groups 1 and 2, respectively; while, one 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) for groups 1 and 2, respectively. Multivariate vector analysis, revealed no statistical significant difference between the two groups for preoperative astigmatism, postoperative astigmatism and surgically induced astigmatism (p>0.05 for all comparisons between group 1 and group 2).


Femtosecond-assisted and manual CCIs for cataract surgery do not seem to significantly alter corneal astigmatism, while they demonstrate comparable SIA.

Financial Interest:


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