Seeing in the dark

Vision in the dark continues to improve for about 30 minutes after being in bright light, as our eyes switch over from the colour-rich, crisp vision of daylight to the less crisp but more sensitive vision of night. 

Once the eyes are adapted to dark, their most sensitive area is off to one side of 'straight ahead', making it possible to sense something out of the corner of your eye that disappears when you look straight at it.  

Retinal degenerations, a genetic condition called retinitis pigmentosa, and Vitamin A deficiency can all reduce night vision.

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