Whatever happened to Stevie Wonder trying to get his eyesight back due to some pioneering technique?

I remember hearing about that somewhere in the news and have never heard anything since. Anyone know? Incoming search terms:stevie wonder eyesight (3)did stevie wonder get his eye sight back (1)did stevie wonder get his eyesight back (1)stevie wonder did he get his sight back (1)stevie wonder sight backl (1)stevie wonder when will stevey gets [...]
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