According to WHO, there are an estimated of 253 million cases of vision impairment worldwide and among them, almost 36 million people are blind. Major causes of these vision impairment include cataract, refractive errors, glaucoma etc. If these eye-related disorders, mainly cataract and refractive errors, are not corrected timely, can cause blindness. There is a decrease in the prevalence of vision impairment due to awareness of general population, socioeconomic development and increased availability of eye care services. However, the number of cases with vision impairment could triple due to population growth and aging.