Artist Sargy Mann has been blind for the last 25 years
Sargy Mann has been painting all of his professional life, first as a teacher and later as a professional artist.
In his mid-30s he developed cataracts on both eyes, eventually leading to total blindness. He continued to paint.
Twenty-five years later, Sargy's work is highly sought-after by collectors, with paintings regularly selling for upward of £50,000 (US$80,000).
He spoke to BBC News about his life and gave an insight into how he continues to work.
Video journalists: James Dowd & Matt Margrett
Real Time is a series for the BBC News website in which ordinary people tell their own extraordinary stories.