There are four types of hypersensitivity reaction, classified according to the way in which the ALLERGEN or ANTIGEN activates the reaction. The classic allergic reaction is the type I hypersensitivity reaction, with exposure to an external substance (the allergen) initiating the IMMUNE RESPONSE.
Flickering lights in vision, Headache and Sudden flash of lights. WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms flickering lights in vision, headache and sudden flash of lights including Migraine headache (adult), Tension headache, and Ocular migraine.
SYMPTOMS: SUDDEN LOSS of VISION: Potential Causes; AMAUROSIS FUGAX: Temporary, monocular, ischemic blindness. Painless; Caused bu ipsilateral Carotid stenosis or embolization of the retinal artery. RETINAL DETACHMENT: Flashing lights, floating halos, and blurry vision before the blindness is indicative of retinal detachment.