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Introduction: Cataract is one of the most important and a major disease in human. The prevalence of cataract in age 65-74 get to 50%, and over 75 it arrives to 70%. Absolute cure for cataract is surgery that can be done by different techniques such as intracapsular, extracapsular, and phacoemulsification. Cataract surgery has different side effects such as hemorrhage, Glaucoma, posterior capsular opacification and astigmatism. This study decides to compare astigmatism after two techniques of cataract surgery phaco and extracapsular. Materials and Methods: This study is a double blind randomized clinical trial, which has been experienced on 112 patients. Patients were divided in two groups (A and B). In group A surgery was done by phaco technique which has a small incision of 3.2 mm and does not need suture. But in group B, (extracapsular group) the incision is bigger about 10 mm and needs suture. Then keratometry was done for each patient before surgery, one week and 2 months after surgery for determining astigmatism. Data was analyzed by independent and paired sample T tests. p< 0.05 was considered meaningful. Results: From 112 patients that had been studied, 56 patients underwent phaco technique and 56 patients underwent extracapsular technique. Mean of astigmatism before surgery in group phaco was 0.79±0.71 D and in extracapsular was 0.90.55 D (p>0.05). Mean of astigmatism 1 week after surgery in phaco group was 1.110.72 D and in extracapsular group was 3.991.46 D (p<0.05) and mean of astigmatism two months after surgery in phaco group was 1.00.71 D and in extracapsular group was 3.281.29 D (p<0.05). Conclusion: Induced astigmatism in phaco group was 0.21 D and in extracapsular was 2.38 D, that has meningful difference. Other criteria such as age, lens number, sex and left or right eye do not have any effect on induced astigmatism.

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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