Neuro-ophthalmology is the study and treatment of eye problems that stem from nervous system conditions or systemic disease rather than just from the eye. Management of the nerve and brain components of the seeing process involves the function of the optic nerve, visual pathways, brain and cranial nerves involved in making vision occur. Issues such as double vision, eye movement disorders, vision loss, blurred or distorted vision, visual field loss, eye pain and eyelid dysfunction are investigated and treated.