'How implanting a tooth in my eye restored my sight'
1 October 2013 Last updated at 10:08 BST
A man who started to lose his sight in 2002 has been speaking about the joy of seeing his twin boys again.
Ian Tibbetts underwent radical surgery which involved implanting part of one of his teeth into his eye.
His journey is described in a new BBC One documentary, The Day I Got My Sight Back, on 8 October 2013.