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.
About Retinal Detachment Symptoms. Symptoms include a sudden or gradual increase in either the number of floaters, which are little cobwebs or specks that float about in your field of vision, and/or light flashes in the eye. Another symptom is the appearance of a curtain over the field of vision.A retinal detachment is a medical emergency.hen the retina separates from the back of the eye, it's called retinal detachment. If you see new floaters or light flashes, or if it seems like a curtain has been pulled over your eye, go to your eye care professional right away.