Stem cells reverse blindness caused by burns (4)

The Italian study (involved) 106 patients treated between 1998 and 2007. Most had extensive damage in one eye, and some had such limited vision that they could only (sense) light, count fingers or perceive hand motions. Many had been blind for years and had had (unsuccessful) operations to restore their vision.
The cells were taken from the limbus, the rim around the cornea, the clear window that (covers) the colored part of the eye. In a normal eye, stem cells in the limbus are like (factories), churning out new cells to replace dead corneal cells. When an injury kills off the stem cells, scar tissue forms over the cornea, (clouding) vision and causing blindness.