Zaheer Umar, Abdul Haleem, Abdur Rashid Shaeikh, Muhammad Faisal Fahim.
Surgically Induced Astigmatism After Superotemporal & Superonasal Clear Corneal Incisions in Phacoemulsification.
Ophthalmol Update Jan ;14(1):37-41.

Objective: To evaluate surgically induced astigmatism (SIA) after superotemporal and superonasal clear corneal incision in phacoemulsification cataract surgery. Material & Methods: This prospective study comprised of 88 patients, 49 right eyes and 39 were left eyes underwent phacoemulsification with foldable intraocular lens (IOL) through clear corneal incision (CCI). A superotemporal and superonasal incision was used in all right eyes and all left eyes respectively. Autorefractometer-keratometer was used to measure corneal astigmatism preoperatively and on 1st week, 6th week and 12th week postoperatively. Surgically induced astigmatism was calculated with computer based software SIA calculator version 2.1. The software utilized the Cartesian co-ordinates based method as suggested by Holladay.21,24 Results: The centroid of SIA was 0.30 + 0.46 @ 79 for right eyes patients with superotemporal incision and 0.33 + 0.44 @ 43 for left eye patients. The magnitude of postoperative astigmatism was slightly higher in superotemporal group (0.83 � 0.58) than in superonasal group (0.78 � 0.54). The magnitude of surgically induced astigmatism was lower in superotemporal group (0.84 � 0.57) than in superonasal group (0.90 � 0.46). There was no statistically significant difference in surgically induced astigmatism between two groups at 12th week of follow up (>p0.05). Conclusion: we found that there is no statistically significant difference in SIA between either superotemporal incisions in the right eyes or superonsal incision in the left eyes (Student T test: p> 0.05).

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