728 patients of visual impairment were examined. The causes of visual impairment were myopia, hyperopia, astigmatism, presbyopia and some cases of post - operative surgical aphakia. After the rehabilitation of visual impairment, there are 150 cases which have the vision less than 6/18 (low vision) which is 14.42%. In patients less than 14 years of age which usually have the nystagmus, have the vision less than 6/18 which is 55.56%, but in overall of cases they have the vision more than 6/18 which is 74.90-93.93%.