Glaucoma occurs when the optic nerve, which connects the eye to the brain, becomes damaged.

Ian Miles/Global

The sight of mice with damaged optic nerves has been partially restored by the growth of new nerve cells in the eye that can replace the dead ones. The hope is that the approach could help treat people with optic nerve damage that causes blindness, such as glaucoma.

“We can regenerate these cells,” he says. Baraj Mehto Children’s Hospital Los Angeles in California. But more studies will have to be done in larger animals before that…