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 a retinal tear and a retinal detachment can include the following: A sudden increase in size and number of floaters, indicating a retinal tear may be occurring; A sudden appearance of flashes, which could be the first stage of a retinal tear or detachment; Having a shadow appear in the periphery (side) of your field of vision; Seeing a ...