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.
How Do I Know If The Flashing Lights Are Signs Of A Problem? Most of the time the vitreous separates from the retina without causing any symptoms. Sometimes, however, there is a sudden occurrence of flashing lights with many new floaters or even with a blacking out of part of the field of vision.