St. Dunstan is also counted as an intercessor for those with visual impairments, as well as for goldsmiths and silversmiths. He was from England. For a summary of his story, see http://saints.sqpn.com/saint-dunstan-of-canterbury/
The site contains references to other sites that provide additional information about St. Dunstan.
Here are two I found to be helpful:
Christian Biographies http://elvis.rowan.edu/~kilroy/JEK/05/19.html