How are ocular migraines different from other migraines?

Retinal migraines. Retinal or "ocular" migraines present as visual disturbances usually associated with migraine aura, without the headache. The mechanism is unknown but is sometimes associated wiith women who reach menopause who have a history of migraine headache. After menoppause, their headache pattern changes to that of retinal migraine: in other words, they get the aura but no headache.
See below. Ocular migraines describe visual disturbances (aura) affecting vision out of both eyes. These can vary from jagged lines, to scintillating lights which tend to move outward over several minutes, but not followed by developing migraine headache.