A visually impaired girl holds a model of Intex Vision, a mobile phone designed for the visually impaired, during its launch in New Delhi April 19, 2011. The phone has a large Braille keypad to facilitate the recognition of digits. India has the world's largest blind population and the phone is designed to enhance the quality of life of visually impaired people, a media release said. REUTERS/Adnan Abidi (INDIA - Tags: BUSINESS SCI TECH SOCIETY)