Thank you for your question. The condition you are experiencing is called photo-sensitivity. This is one of the most common symptoms experienced by persons suffering from migraine headaches. The exact mechanism of why light can trigger migraines has not completely been elucidated however, it is believed that the stimulation of the retina by light within the eye can exacerbate migraines. When light hits the retina at the back of the eye ball, it sends a signal to the brain which is processed in order for you to see. It is in this signalling pathway that pain receptors of the dura (protective covering of the brain) become stimulated thereby potentiating an attack of your migraines.
Thank you for choosing AskTheDoctor.com
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.