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.
Migraines are a common type of headache that can cause severe pain, aura or flashes in vision, and tingling. Nearsightedness is a common eye problem that causes blurry, distant vision. There are many types of eye injury, and symptoms include eye pain, burning, irritation, bleeding, and more.