Diplopia has a diverse range of ophthalmologic, infectious, autoimmune, neurological, and neoplastic causes.
Abscess；Anisometropia；Antipsychotics (Haloperidol, Fluphenazine, Chlorpromazine etc.)；Botulism；Brain tumor；Cannabis；Cancer；Damaged third, fourth, or sixth cranial nerves, which control eye movements；Cataract；Diabetes；Drunkenness；
Fluoroquinolone antibiotics；Graves disease；Guillain–Barré syndrome；Keratoconus；
Lyme Disease；Migraine headaches；Multiple sclerosis；Myasthenia gravis；Opioids
；Orbital myositis；Trauma；Salicylism；Sinusitis；Strabismus；Wernicke's syndrome，etc.
Diplopia is diagnosed mainly by information from the patient. Doctors may use blood tests, physical exams, computed tomography (CT) or magnetic resonance imaging (MRI) to find the underlying cause.
you should see a Neurologists and ophthalmologists.