Some visually challenged Indians have great achievements to their credit. Diwakar, a child prodigy has given amazing performances as a singer. Mr. Ravindra Jain, born completely visually challenged, obtained his Sangeet Prabhakar degree from Allahabad. He has shown his excellence as a lyricist, singer, and music composer. Mr. Lal Advani, himself visually challenged, established an Association for special education and rehabilitation of disabled in India. Besides, he represented India on Braille problems to UNESCO.

Some of the learners also asked:
Define the optical aids