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.
Perhaps it is blurred or obscured by bright flashes of light and color. Or maybe, more frighteningly, a blind spot develops in one eye, causing you to lose all sight in that eye. These kinds of visual changes are symptoms that are often referred to retinal and ocular migraines. However, they are not one in the same.