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Blind people with undamaged eyes may still register light non-visually for the [[purpose]] of [http://en.wikipedia.org/wiki/Circadian_rhythm circadian entrainment] to the 24-hour light/dark cycle. Light signals for this [[purpose]] travel through the retinohypothalamic tract, so a damaged optic nerve beyond where the retinohypothalamic tract exits it is no hindrance.[http://en.wikipedia.org/wiki/Blindness]
Blind people with undamaged eyes may still register light non-visually for the [[purpose]] of [http://en.wikipedia.org/wiki/Circadian_rhythm circadian entrainment] to the 24-hour light/dark cycle. Light signals for this [[purpose]] travel through the retinohypothalamic tract, so a damaged optic nerve beyond where the retinohypothalamic tract exits it is no hindrance.[http://en.wikipedia.org/wiki/Blindness]
==See also==
*'''''[[Deafness]]'''''
[[Category: Health]]
[[Category: Health]]
