Retinal migraine causes temporary blindness or visual disturbances in one eye. Usually, these symptoms precede a headache, but not always.
Some practitioners use the term ocular migraine to refer to retinal migraine, but strictly speaking, the retinal migraine is one of two subtypes of ocular migraine. The other type of ocular migraine is migraine with aura, in which the visual disturbances that come before head pain affect both eyes. The difference is that in retinal migraine, the vision symptoms are coming from the eye (so are only seen with one eye), while in migraine with typical aura the vision symptoms are coming from the brain (so are seen with both eyes).
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