Hi @joyluc1330, please accept my late welcome to Connect.
I can't imagine what it must have been like for you and your son to be hospitalized for 8 months. Was his diagnosis of acute disseminated encephalomyelitis (ADEM) confirmed? How is your son doing now that he is at home? How are you?

You mentioned that one of your biggest concerns is the complications with his vision and ask about visual snow. I invite you to join this discussion on Connect, where you'll meet others like @ktshy @erikassf @danny59 @amyjo @carlie2 and @jglacken56, who are dealing with visual snow:
Visual Snow: Anyone experience this? https://connect.mayoclinic.org/discussion/visual-snow/