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.
Some migraines are preceded by sensory warning symptoms called auras. In the case of ophthalmic migraine, the aura will be visual in nature and may be described as: Seeing flashing or flickering lights (scintillations) Seeing zig-zag lines or waves. Seeing an enlarging blind spot (scotoma) in the center of the visual field.