Zaheer Umer, Abdul Haleem Mirani.
Comparison of Surgically Induced Astigmatism after Phacoemulsification Vs Extra Capsular Cataract Extraction.
Ophthalmol Update Jan ;12(1):33-6.

Purpose of study: To compare the results of surgically induced astigmatism (SIA) in patients who underwent Phacoemulsification and extra capsular cataract extraction with posterior chamber intraocular lens implant. Setting: Isra Postgraduate Institute of Ophthalmology, Karachi Methods: This prospective study comprised of 200 patient, 100 eyes (100 patients) underwent phacoemulsification through clear corneal 3.2 mm incision with foldable IOL implantation, while in 100 eyes (100 patients) ECCE with a superior corneal section 8.00 to 10.00mm in size was performed with 6.5 mm optic size posterior chamber PMMA IOL implantation. Automated keratometery was performed preoperatively and post operatively on 1st day, 2nd week, 6th week and 12th week. 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 Dr. Holladay. Results: The mean SIA was 0.74 D x 171 for patients undergoing conventional ECCE Surgery and 0.42 D x 43 for patients having Phacoemulsification Surgery (p <0.001) at three month of follow up. Conclusion: Phacoemulsification with intraocular lens implantation results in lower SIA than ECCE surgery and faster visual rehabilitation than conventional extracapsular cataract extraction.

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