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Introduction: Cataract is a type of tarnish observable opacity in different layers constituting the lens and will cause light occlusion or scattering. Necessity for treatment of Cataract via surgery and its close relation with corneal astigmatism, when we applied a new method in cutting and type of cataract surgery, led us to measure the post-operation corneal astigmatism changes in frown incision Phacosection. Materials and Methods: This interventional study has been done on 73 eyes(58 patients). These patients were gone under Cataract surgery via no stitch frown incision scleral tunnel phacosection method. In this study we have 7mm external scleral incision with no suture. They were Keratometerized in four separate periods including pre-operation, one week, one month and three months post- operation. Data was analyzed using independent and paired t-tests. Results: Age, sex and left or right eye had no influence on astigmatism. Mean pre- operation astigmatism was 0.84 ± 0.87D, mean astigmatism 1 week post- operation was 0.27 ± 0.88 D, 1 month post- operation 0.06 ± 0.82 D, and three months post-operation was -0.03 ± 0.85 D (P= 0.0001). Before operation, 80% of the patients did have an astigmatism rate less than 1D that increased to 94.5% in three months period after operation and in 89% of the cases, the ultimate change in astigmatism has been found lower than 1D. The obtained information revealed that there is a meaningful difference between pre-operation astigmatism and the same after one week, one month and three months post-operation(P= 0.0001). Independent sample t and paired t-test were used to analyse data. Conclusion: Our study indicated that the no stitch frown incision scleral tunnel phacosection surgery can reduce pre-op corneal astigmatism, and because of induction of the slight controlled astigmatism we can apply this technique for all cataractic patients

Keywords: Cataract, Phacosection, astigmatism, scleral tunnel, frown incision.

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