8 month child has brain stroke due to lack of oxygen. now he is facing problem like vision, hearing?

Hey, I'm really sorry for what happend to your child.
How long did he stay out of oxygen?
If its more than 5 minutes he could have serious brain damage and will probably be diagnosed with epilepsy, autism, hearing disabilities maybe psychomotor problems.
I had a stroke age 2 and I'm fine, so it depends how and which treatment your chils has:) gud luck