Hi @pedie, You must be so concerned for your son. Being told that "nothing can be done" is hard to hear. I am not familiar with Ischemic Optic Neuropathy, so I referred to this article written by Mayo expert, Dr. James Garrity http://bit.ly/2quDEIY

From this article, I learned:
"About 40% of people with nonarteritic ischemic optic neuropathy spontaneously recover some useful vision. In this condition, repeat episodes in the same eye are extremely rare. Involvement of the other eye is estimated to occur in about 20% of affected people over the next 5 years."

"In people with nonarteritic ischemic optic neuropathy, treatment involves controlling blood pressure, diabetes, and other risk factors for atherosclerosis. Other causes, such as blood-clotting disorders and obstructive sleep apnea, may also require treatment."

Pedie, does you son have atherosclerosis?