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Retinal migraine (also known as ophthalmic migraine, visual migraine and ocular migraine) is a retinal disease often accompanied by migraine headache and typically affects only one eye. It is caused by an infarct or vascular spasm in or behind the affected eye. The terms "retinal migraine" and "ocular migraine" are often confused with an abnormal condition in the brain (cortical spreading depression) that may cause similar symptoms such as scintillating scotoma affecting vision in both eyes, also associated with migraine headaches. ==Symptoms== Retinal migraine is associated with transient monocular visual loss (scotoma) in one eye lasting less than one hour. During some episodes, the visual loss may occur with no headache and at other times throbbing headache on the same side of the head as the visual loss may occur, accompanied by severe light sensitivity and/or nausea. Visual loss tends to affect the entire monocular visual field of one eye, not both eyes. After each episode, normal vision returns. It may be difficult to read and dangerous to drive a vehicle while retinal migraine symptoms are present. Retinal migraine is a different disease than scintillating scotoma, which is a visual anomaly caused by spreading depression in the occipital cortex at the back of the brain, not in the eyes nor any component thereof.〔(【引用サイトリンク】title=imigraine.net )〕 Unlike in retinal migraine, a scintillating scotoma involves repeated bouts of temporary diminished vision or blindness and affects vision from both eyes, upon which sufferers may see flashes of light, zigzagging patterns, blind spots, or shimmering spots or stars.〔(【引用サイトリンク】url=https://www.ohiohealth.com/theme_of_focus/clinical_focus_concept/ocular_migraine__when_to_seek_help/ )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「retinal migraine」の詳細全文を読む スポンサード リンク
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