Original Research Article
Year: 2019 | Month: October | Volume: 6 | Issue: 10 | Pages: 146-162
Effect of Surgically Induced Astigmatism on Sutured and Sutureless Incisions Placed at Various Superior Locations, after Phacoemulsification Cataract Surgery Performed for Age Related Cataracts
Dr. Prakriti Chourasia1, Dr. A.D. Mehta2
1Assistant Professor, 2Professor and HOD,
Department of Ophthalmology, ESIPGIMSR, Basaidarapur, New Delhi-110015
Corresponding Author: Dr. Prakriti Chourasia
ABSTRACT
Over the years cataract surgery has undergone & is undergoing continuous refinements as it is one of the most gratifying rehabilitative (and curative at the same time) procedure in the medical practice. But what has not changed over the period is association of postoperative astigmatism with cataract surgery & uphill task for ophthalmologists to minimize it. In recent years, the evolution of the cataract operation has involved a progressive decrease in size of the incision for the extraction of the degenerated crystalline lens. Practically we have manual small incision cataract surgery (MSICS), Coaxial Phacoemulsification, Micro-Coaxial Phacoemulsification and Bimanual Microincision cataract surgery (B-MICS) in our hand to give our patients best possible visual outcome in terms of lesser and lesser astigmatism. 120 patients were selected for this study and divided in six groups. Within each group, each surgical technique was kept nearly constant and patients requiring an intraoperative alteration in the techniques were omitted from the study. Postoperatively, only those cases were kept in the study that did not have any confounding factors like postoperative inflammation that could have a bearing on visual outcome and corneal astigmatism. Dosage of topical steroids was also kept constant ( i.e. 4 times daily in 1st week, 3 times daily in 2nd week, and 2 times daily in 3rd week) post-operatively. All other possible factors were kept constant. Neither age nor sex proved to be statistically significant in either of 6 groups across the study.
All patients were examined pre-operatively and post-operatively (on day 1 and 7 and at 1 and 3 months) to note keratometric (K1and K2) values and to calculate preop. and postop. astigmatism. All data was carefully accumulated, arranged and assessed statistically to derive significant conclusions using appropriate statistical method.
In our study SIA was studied for evolution, stability and its magnitude in 6 study group:
Surgically induced astigmatism was calculated using SIA Calculator based on the method of Holladay et al i.e. converting the pre-operative and post-operative astigmatism values in their components at X axis and at Y axis. Then Cartesian – coordinates is converted into astigmatic vector form.
Key words: Astigmatism, Phacoemulsification, Cataract Surgery
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