Abstract
Objective: To determine surgically induced astigmatism (SIA) in Chevron (inverted V shape), frown, Boat shaped and straight incisions in manual small incision cataract surgery conducted in patients admitted in RIMS, Srikakulam.
Material and Methods: study was conducted in patients getting admitted for cataract surgery in Rajiv Gandhi Institute of medical Sciences, Srikakulam, Andhra Pradesh. 100 patients were randomly selected who are above 40 years of age and senile cataract. They were divided into 4 groups with 25 each in each group. All four groups underwent similar manual incision cataract surgery with carefully placed intraocular lenses. Only difference between 4 groups is the type of incision during the beginning of cataract surgery. Patients were compared 6 weeks post operatively for uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA) and surgically induced astigmatism. The datas obtained were tabulated and analyzed statistically using paired and unpaired t test and chi square test using SPSS version 17 software.
Observation: In our study Chevron incision produced minimal astigmatism with maximum patients (48%) with astigmatism between 0.5-1D. Followed by (36%) in 0.6-1D. Frown and boat shaped incisions showed almost similar results. There was significantly small difference between them which was negligible. in Frown incision maximum patients (44%) had astigmatism 1.1-1.5D followed by(28%) 0.5-1D. in boat shaped incision maximum patients(36%) were seen in 1.1-1.5D followed by(28%) 0.5-1D. straight incision showed significantly higher astigmatism with maximum patients (40%) between 1.1-1.5D.
Conclusion: Chevron incision (inverted V incision) induced significantly less surgically induced astigmatism followed by frown incision and boat shaped incision. Straight incision caused maximum surgically induced astigmatism.
Keyword: surgically induced astigmatism, chevron incision, frown incision, boat shaped incision, straight incision, MSICS, comparitive study.
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Corresponding Author
Dr Rajkumar Patra
Senior Resident, Department of Ophthalmology,
RIMS, Srikakulam
DOI: https://dx.doi.org/10.18535/jmscr/v5i12.69
