Rajatheja, M. K. B. C.; Wijayasiriwardhane, T. K.
(International Research Symposium on Pure and Applied Sciences, 2017 Faculty of Science, University of Kelaniya, Sri Lanka., 2017)
According to a fact sheet published by the World Health Organization (WHO) in 2014, it is estimated that 285 million people are visually impaired worldwide and out of which 39 million of people are blind. Further, about ...