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.
10 Things Your Eye Doctor Wants You to Know. Retinal detachment is a serious condition that can lead to blindness in the affected eye. Seek immediate medical care (call 911) if you have serious symptoms such as sudden blurring of vision, bright flashes of light, sudden increase in floaters, and partial blindness.