Astronomers speak to the an approach ‘averted vision’, and also it exploits the truth that our eyes contain two species of light-detecting cells. About the centre of the retina are so-called cone cells, which provide us colour vision and need good light levels.

Away indigenous the centre are rod cells, which are responsible for black-and-white vision, and also work much better than the cone cells at low light levels. Looking off to one next allows much more light from pass out objects come strike the rod cells, and also become visible to us.

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Robert is a scientific research writer and visiting professor of scientific research at Aston University. The likes maths, West finish musicals and also hamsters.


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