<unk>  is caused by the blood vessels (that leads to the eye) suddenly narrowing (constricting), reducing blood flow to the eye, which causes aura in vision. It may be triggered by: *Stress *Smoking *High blood pressure *Oral contraceptive pill *Exercise * Hay Fever *Bending over *High altitude *Dehydration *Low blood sugar *Excessive heat Afterwards, the blood vessels relax, blood flow resumes and sight returns. Usually there are no abnormalities within the eye and permanent damage to the eye is rare.<unk>  tends to be more common in: *Women *People aged under 40 *People with a personal or family history of<unk> s or other headaches *People with an underlying disease (lupus, hardening of the arteries, sickle cell disease, epilepsy, antiphospholipid syndrome, and giant cell arteritis)
Retinal migraine
Scintillating scotoma
Optic papillitis
Aura (symptom)
Optic neuritis
Ocular ischemic syndrome
Diabetic papillopathy
Primary juvenile glaucoma