Well, an issue with the inner ear can be the cause of the problem here.
Inner ear problems could cause issues with hearing -- as well as vertigo, or the spinning sensation which could be causing his problems with the coordination.
The ENT doctor is the specialist in evaluating these issues, and so they would be the person to see. They likely will do a physical exam, and get hearing tests done (audiogram) as well as imaging of the brain (MRI of the brain) to look for potential causes of this problem.
These issues likely wouldn't have anything to do with his eyes, so an optometrist is not the person who can evaluate these issues.
I'm sorry, he went to an Audiologist and he is the one that recomended he see an EMT. He has 87% of his hearing in the right ear & 35% in the left. Coupled with his lack of coordination and his exstream change in
his sight makes me worry about a brain tumor.