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Sunit Kumar Misra, Jonathan Paul, Peter Callas; Persistence of Induced Corneal Astigmatism after Suture Removal. Invest. Ophthalmol. Vis. Sci. 2017;58(8):1805.
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To determine if the use of corneal sutures causes an increase in surgically induced astigmatism (SIA) that persists after suture removal, by measuring keratometry. A retrospective chart review was performed to test this hypothesis.
A retrospective chart review of human eyes that received cataract surgery performed by a single surgeon at a university medical center. Inclusion criteria were patients above 18 years old, who had pre and post-operative keratometry measurements recorded. 517 eyes were studied, all of which received a 2.75 mm clear corneal incision. Of the 517 eyes, 52 of the eyes received nylon sutures to the clear corneal incision, and 465 eyes did not. Keratometry measurements taken before and after the procedure were used for computation and statistical analysis. The Jaffe equation1was used to calculate SIA, which was the studies outcome measure. A 2 sampled confidence interval was used to evaluate the differences between the groups.
Both sutured and non-sutured groups had showed astigmatic changes after surgery. The sutured group showed a change of .61+.36D, while the non-sutured group showed a change of .65+.48D. Statistical analysis showed no significant differences between the two groups.
The amount of astigmatism induced by cataract surgery does not seem to be different when using sutures, since the 95% confidence interval contains a null value of 0. The data gathered and used for this experiment only comment on the magnitude of the induced astigmatism. The results of this study suggest that using nylon suture to secure a clear corneal incision will not significantly affect the amount of induced postoperative corneal astigmatism after the suture is removed. Other studies demonstrate suture material, length of the suture, and tightness of the suture do have influence the axis of orientation of post-operative astigmatism1,2,3. 1. Jaffe NS, Clayman HM: The pathophysiology of corneal astigmatism after cataract extraction. Trans Am Acad Ophthalmol Otolaryngol 79:OP615-OP630, 1975.2. Van Rij G, Waring GO. Changes in corneal curvature induced by sutures and incisions. Am J Ophthalmol 1984;98:773-83.3. Basti S, Vasavada A, Thomas R, Padhmanabhan P. Extracapsular cataract extraction: surgical techniques. India 1993;41(4):195-210.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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