What is Retinal migraine?
{{Infobox disease | Name = Retinal migraine | Image = Eyevessels 001.jpg | Caption = This is the back part or ''fundus'' of a human eye. The retina is a part of the fundus.<br> Retinal migraine is thought to happen because of ''vasospasm'' of the blood vessels that supply blood to the retina, or of the ''ophthalmic artery'' which is the artery that brings blood to the eye.<br> Vasospasm causes the blood vessels to get narrower (''vasoconstriction'') so that not enough blood is going through the blood vessels.<ref>Burger SK, Saul RF, Selhorst JB, Thurston SE. Transient monocular blindness caused by vasospasm. N Engl J Med. 1991 Sep 19;325(12):870-3. PMID 1875972</ref> | DiseasesDB = | ICD10 = G43.81 | ICD9 = | ICDO = | OMIM = | MedlinePlus = | eMedicineSubj = | eMedicineTopic = | MeshID = }} '''Retinal migraine''' (also known as ophthalmic migraines, or ocular migraines) is a medical condition that affects the eyes by causing vision loss in one eye for less than 1 hour, usually for about 10–20 minutes. When these retinal [[migraine]]s happen they can also cause a headache, either a ''diffuse'' headache which is a headache that causes pain which is spread out and hurts a person's whole head, or, a ''unilateral'' headache, which is a headache that causes pain on one side of a persons head either, the left side or the right side.<ref>Joel S. Glaser: Neuro-Ophthalmology, 3rd edition. Lippincott Williams & Wilkins, 1999; p.567 {{ISBN|0781717299}}</ref> It is believed retinal migraines are caused by ''vasospasms ''of the blood vessels of the eye in the area of the ''retina''. The retina is at the back of the inside of the eye. In medicine a ''spasm'' is a sudden constriction or tightening of muscles that is ''involuntary'' - a person does not control them they move on their own. Muscle spasms can happen in different muscles of the body, like when a person's leg or eye ''twitches''. The twitching is caused by the spasms. ''Vas