Cataract is the opacification of the human crystalline lens and it is the commonest cause of blindness responsible for more than 50% of world blindness. Surgery is the only definitive treatment for mature cataract. This prospective clinic based study was carried out to evaluate the visual outcome and causes of poor vision of patients who had cataract surgery in the hospital. All the patients that presented to the hospital with mature age related cataract 40 years and above without systemic or ocular complication that will affect the visual outcome, that consented were enlisted in the study. A total of 1278 eyes of 1025 patients participated in the study. There were 772 uniocular and 253 bilateral cases. All patients had routine extracapsular cataract extraction with posterior chamber intraocular lens implant with 21.50DS being the commonly used intraocular lens power. The visual outcome at two months postoperative period revealed that 76.2% (554) of the uniocular cataracts and 61.4% (322) of the bilateral cataracts had good uncorrected visual acuity (UCVA) presenting vision [based on WHO visual outcome grading(>/=6/18)] and after correction 97.0% of the uniocular and 91.0% of the bilateral had good best corrected visual acuity (BCVA) respectively. Surgically related cause of poor visual outcome accounted for 96% of the total poor outcome which was due to astigmatism, sequelae accounted for 2.1% while selection and spectacle rejection accounted for 2.1% and 1.1% respectively. One defaulted patient had endophthalmitis in the right eye for which evisceration was done, from the result it was observed that the patients had good visual outcome and astigmatism was a major problem.