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Lei Zheng, John C. Merriam; Comparison of surgically-induced astigmatism after a 2.2 mm vs. 2.6 temporal corneal incisions in more than 2 years follow-up. Invest. Ophthalmol. Vis. Sci. 2012;53(14):6644.
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To compare surgically induced astigmatism (SIA) after 2.2 and 2.6 mm temporal corneal incisions.
This retrospective study includes 344 eyes of 222 patients with a 2.2 mm incision and 406 eyes of 279 patients with a 2.6 mm incision. Before and after surgery, the surgeon measured corneal curvature with a manual keratometer (Bausch & Lomb). Data were entered into File Maker Pro and grouped into 11 time intervals (1 day, 1 week, 2 weeks, 1 month, 2 months, 4 months, 6 months, and every 6 months thereafter up to 30 months). SIA for each eye at each time interval was calculated with the Jaffe method. The difference in SIA between the 2.2 mm and 2.6 mm incisions at each follow-up interval was determined with the "two sample t-test", and one- way ANOVA was used to compare SIA at each postoperative interval within each group. A best fit equation modeled the change in SIA after each incision.
Mean SIA is greater at all intervals after the 2.6 mm incision than the 2.2 mm incision (see picture 1), but there are no statistically significant differences (all p values are greater than 0.05) in SIA after the 2.2 mm and 2.6 mm corneal incisions at any postoperative time. After one week, including 1 week, SIA after each incision does not change significantly (p value is 0.67 for 2.2 mm incision and 0.94 for 2.6 mm incision).
SIA is greater at all time intervals after a 2.6 mm incision. The smaller 2.2 mm incision should theoretically accelerate healing and stabilization of the wound and the cornea. However, this study does not show a significant difference in SIA after these two incisions during the initial 30 months after surgery.
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