Upper neck work would be by a Upper Cervical Chiropractor (NUCCA.org) or a Physical Therapist who does a little gentle traction with gentle manipulations.

You did not explain what the vision issue you have other than struggling to watch TV or a computer screen.

Do you have a hi def TV or old normal resolution tube TV?

Is you computer a flat screen or a CRT display (big box old TV like monitor)?

Do you have surround sound with your TV?