Coronado teen loses sight at 13 to rare disease, finds new purpose running track

Coronado teen loses sight at 13 to rare disease, finds new purpose running track

CORONADO, Calif. (KGTV) A rare genetic disease left a Coronado teenager legally blind at 13. Now he's running track and helping drive research for a cure.Xavier Marsh was 13 years old when his vision began to deteriorate rapidly. Within two months, he went from perfect 20/20 vision to 20/800 legally blind after being diagnosed with Leber Hereditary Optic Neuropathy, or LHON, a genetic mutation passed down from his mother that can result in sudde…