Treat underlying condition
Symptoms will often resolve on their own. Patients with cerebrovascular disease are less likely to have recovery.
Patching of eye can aid in relief of diplopia
Diframpadine, potassium channel blocker, has been used in patients with demyelinating disease
Internuclear ophthalmoplegia
Multiple sclerosis 
Nystagmus
Stroke
Ocular palsy
Malignancy located in brainstem and 4th ventricle
Facial paralysis
CN III palsy would show additional deficit including weakness of elevation, ptosis, pupil dilation