Experts were “blown away” by a new treatment that gave blind mice their sight back.

The brain’s plasticity and capacity for lifelong rewiring continue to
astound neuroscientists. Despite the rodents’ advanced age, scientists have
discovered a way to cure congenital blindness in adult mice.
Leber congenital amaurosis (LCA) is a rare retina abnormality that can
result in blindness or severe vision impairment in newborns. The mice were
used to simulate the effects of this condition in humans.
Any of a large number of genes involved in light perception in the retina
seems to be at fault for this inherited disorder.