Harvard Experiments found the reason that light can trigger their migraine-headaches to the blind people. They are also sensitive to light. There are two kinds of blind patients: one group is absoluetly blind and won't be affected by the light. The other group are although classified as legally blind because of their particular eyes diseases "retinitis pigmentosa", they can still detect light, especially in blue or grey wavelengths.
Some suggestion to second group of blind patients who are sensitive to light is that the photophobia stirs their optic nerve because it does not transmit light signal to the patients' brain
when they expose to light. This must trigger their severe headaches.
Health
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References
(Harvard tests reveal why light can worsen migraines. (2010, January 11). BBC News. Retrieved January 12, 2010 from http://news.bbc.co.uk/2/hi/health/8449288.stm
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