▁the ▁transition ▁to ▁sight ed ness ▁difficult . ▁ ▁In ▁ 1 9 9 2 , ▁a ▁p neum onia ▁in fection ▁resulted ▁in ▁an ox ia , ▁and ▁ultimately ▁cost ▁Jenn ings ▁his ▁vision ▁again . ▁ ▁Sh ander ▁Her ian ▁In ▁ 2 0 1 1 , ▁The ▁Guardian ▁published ▁a ▁story ▁about ▁Sh ander ▁Her ian , ▁who ▁was ▁blind ed ▁by ▁ill ness ▁at ▁the ▁age ▁of ▁ 1 4 ▁and ▁fully ▁recovered ▁after ▁an ▁experimental ▁surg ery ▁in ▁middle ▁age . ▁ ▁Modern ▁history ▁More ▁recently , ▁another ▁condition ▁called ▁an ir idia ▁has ▁been ▁treated ▁with ▁re construct ive ▁surg ery ▁using ▁the ▁memb rane ▁from ▁the ▁am ni otic ▁sac ▁that ▁surr ounds ▁a ▁fet us ▁combined ▁with ▁stem ▁cell ▁trans plant ation ▁into ▁the ▁eye . ▁In ▁ 2 0 0 3 , ▁three ▁people ▁were ▁successfully ▁impl anted ▁with ▁a ▁permanent ▁" ret inal ▁prost h esis " ▁by ▁research ers ▁at ▁the ▁University ▁of ▁Southern ▁California . ▁Each ▁patient ▁wore ▁spect acles ▁with ▁mini ature ▁video ▁cam eras ▁that ▁transm itted ▁signals ▁to ▁a ▁ 4 - mm - by - 5 - mm ▁ret inal ▁impl ant ▁via ▁a ▁wireless ▁receiver ▁embedded ▁behind ▁the ▁ear . ▁ ▁See ▁also ▁Bl inds ight ▁– ▁when ▁a ▁blind ▁person ▁can ▁perce ive ▁visual ▁stim uli ▁un cons ci ously . ▁Hand - ey e ▁coord ination ▁S tere opsis ▁recovery ▁– ▁recovery ▁of ▁s tere o ▁vision ▁ ▁Notes ▁ ▁References ▁ ▁Hann an