I do not want to alarm you, but mine is perm.. I have two inflammation tumors pressing against my optical nerves. There is good inflammation, and bad inflammation obviously mine is the bad. My tumors are rare, caused from a rare autoimmune disease. It is unlikely your son has tumors, but that is why I said a MRI. MRIs will show any inflammation, sinus problems, fluid, so on.
The thing that helped me with my eye vision is at first I wore eye patches. I told kids I was a pirate and turned it into a game LOL. Then, I became stable enough for the rheumy and eye surgeon to put a detachable plastic prism on my eyeglasses. The prism takes my 3 and puts it into one.
I hope this helps...
"The Walking Medical Mystery"
Too many Allergies / Too many RXs & DXs
A Rare Gem for Doctors and Guinee Pig
~Medical Caregiver and Doctors Worse Nightmare~