Original Research Article
Year: 2019 | Month: September | Volume: 6 | Issue: 9 | Pages: 328-336
Comparison of Surgically Induced Astigmatism in Manual Small Incision Cataract Surgery Following Straight Versus Frown Incision
Dr. Prakriti Chourasia1, Dr. Gaurav Kumar2, Dr. Sandeep Kumar3
1Assistant Professor, 2Senior Resident, 3Director Professor,
ESIPGIMSR, Basaidarapur, New Delhi - 110015.
Corresponding Author: Dr. Gaurav Kumar
ABSTRACT
High astigmatism is an important cause of poor uncorrected visual acuity after cataract surgery. Surgically Induced Astigmatism (SIA) plays an important role in final post operative visual acuity. The aim of the study is to compare the astigmatism induced by a straight and frown incision in manual SICS (MSICS) in patients with Immature Pre-senile and Senile Cataract.
This is a randomized, prospective study conducted at the Department of Ophthalmology, ESIPGIMSR, Basaidarapur, New Delhi. The patients undergoing manual SICS were selected for the study strictly adhering to the inclusion and exclusion criteria. The patients were randomly divided into two groups, that is Group A, 50 patients (patients who underwent MSICS with frown incision) and Group B, 50 patients (patients who underwent MSICS with straight incision).
In Group A (frown incision group), the mean SIA was 0.83±0.53 D and in Group B (straight incision group), the mean SIA was 1.37±0.92 D post-operatively after 90 days. The comparison between the mean of the two groups using ‘unpaired t test’ was statistically significant (p<0.05) indicating that group B had more SIA.
The relative increase in astigmatism in Group B with straight incision is due to the proximity of the incision to the optical centre resulting into comparatively increased corneal changes. In Group A, lesser amount of SIA was due to the location of the incision away from the optical axis and flattening at the incision site was less.
The UCVA was better in the frown incision as compared to the straight incision group.
In conclusion, frown incision is evidently better than straight incision in minimizing surgically induced astigmatism.
Key words: Surgically Induced Astigmatism, Manual Small Incision Cataract Surgery, Straight Incision, Frown Incision.
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