New Yorker Kevin Coughlin was blinded at the age of 36 by Leber Hereditary Optic Neuropathy (LHON).
For years all he could see was a "very thick, impenetrable fog," the Daily Mail reports. Then, three years ago, he caught a glimpse of a ray of sunlight.
Gradually Coughlin's vision kept improving, and in May of this year he saw the face of his guide dog for the first time. He now has about 70 percent of his eyesight, and he and says it is still getting better.
LHON is a hereditary disease that impairs and ultimately destroys optic nerve cells. "It's unprecedented for someone to be blind for nearly 20 years and for them to have their sight come back slowly," Caughlin said.
Read the full story: