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.
If you notice a sudden onset of floaters, flashes of light, or darkness on the sides of your vision, contact an eye specialist immediately. These can be symptoms of an emergency that requires prompt attention. Rate This Article. (Votes: 9) (Avg: 3.89). 1  Currently 3/5 Stars.