Tyson Rettie always loved skiing.
He learned as a child, then during his teens, he moved into backcountry skiing. Eventually, Rettie ended up working as a heli-ski guide.
But that changed when he lost his vision.
Rettie, who grew up in Okotoks and now lives in Invermere, B.C., was diagnosed with a condition called Leber’s hereditary optic neuropathy (LHON) about two years ago. It’s a mitochondrial disease that makes a person’s vision deteriorate very quickly.