The 17-year-old ended up on a strict diet of Pringles, French fries, white bread, processed ham, and sausage for years. Doctors say that he suffered from nutritional optic neuropathy, a dysfunction of the optic nerve caused by a diet low in nutrients required for nerve fibers in the eye to function. The condition can lead to permanent vision loss if left untreated.

Researchers say the boy had visited the family doctor when he was 14 and complained about being tired all the time. They gave him a bunch of vitamin B12 shots and sent him on his way. When he complained about losing his vision recently, doctors found the boy suffered from several bone, vitamin and mineral deficiencies.

By the time doctors had completed the diagnosis, he had already suffered permanent vision loss.

Source: CTVNews