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.
Light flashes may occur in conjunction with floaters or may occur separately. Unlike floaters, light flashes (photopsias) are typically perceived in subdued lighting or even total darkness. Photopsias can range from minimal light twinkles to flashes that are bright enough to suggest a neon sign or camera flash.