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Assessment of corneal astigmatism following frown and straight incision forms in sutureless manual small incision cataract surgery

Authors Ofeibea Amedo A, Amoah K, Koomson NY, Kumah DB, Osae EA

Received 22 October 2015

Accepted for publication 18 February 2016

Published 22 April 2016 Volume 2016:8 Pages 47—52

DOI https://doi.org/10.2147/OPTO.S98920

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Richard Potvin

Peer reviewer comments 3

Editor who approved publication: Mr Simon Berry


Angela Ofeibea Amedo, Kwadwo Amoah, Nana Yaa Koomson, David Ben Kumah, Eugene Appenteng Osae

Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

Abstract: To investigate which of two tunnel incision forms (frown versus straight) in sutureless manual small incision cataract surgery creates more corneal astigmatism. Sixty eyes of 60 patients who had consented to undergo cataract surgery and to partake in this study were followed from baseline through >12-week postoperative period. Values of preoperative and postoperative corneal astigmatism for the 60 eyes, measured with a Bausch and Lomb keratometer, were extracted from the patients’ cataract surgery records. Residual astigmatism was computed as the difference between preoperative and postoperative keratometry readings. Visual acuity was assessed during the preoperative period and at each postoperative visit with a Snellen chart at 6 m. Fifty eyes of 50 patients were successfully followed-up on. Overall, the mean residual astigmatism was 0.75±0.12 diopters. The differences in mean residual astigmatism between the two different incision groups were statistically significant (t [48]=6.33, P<0.05); frown incision group recorded 1.00±0.12 diopters, whereas the straight incision group recorded 0.50±0.12 diopters. No significant difference was observed between male and female groups (t [48]=0.24, P>0.05). Residual corneal astigmatism in the frown incision group was significantly higher than in the straight incision group. Fisher’s exact test did not reveal a significant association between incision forms and visual acuity during the entire postoperative period (P>0.05).

Keywords: cataract, residual corneal astigmatism, frown incision, straight incision

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