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.
For those that do, common symptoms include: 1  Cloudy, fuzzy, foggy, or filmy vision. 2  Glare from lamps or the sun, which may be severe. 3  Difficulty driving at night due to glare from headlights.  Frequent changes in eyeglass 1  prescription. Double vision.  Improvement of near vision (second sight) that then gets worse.