His specializes in neuro-ophthalmology, with special interest in the treatment of thyroid eye disease, disorders that cause double vision in adults and orbital and skull base tumors. His clinical practice includes patients with all types of disorders of the optic nerve and orbit. Dr. Subramanian is the principal investigator in clinical trials on treatments for thyroid eye disease and idiopathic intracranial hypertension and is conducting research on how to treat vision problems in patients with traumatic brain injury.