Eye Health Facts

Aura, after-images and things like that.

Most of the time our vision works automatically, adjusting to changing light levels, colours and shapes and movement, without us noticing the complex task it is performing. But in certain situations so often we get a glimpse at the workings of our visual system:

 

Eye Health Facts

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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