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.
Symptoms of retinal detachment include: 1  A sudden increase in the number of eye floaters and flashes you are experiencing, or the sudden appearance of them for the first time.  The loss of your peripheral vision, usually appearing like a curtain or shadow that moves toward the center of your vision over time.