The Irish Mail on Sunday - - MORE -

We hAve a blind spot in our vi­sion be­cause our retina evolved back-to-front, which means the light has to pass through a mass of blood ves­sels and nerve cells be­fore hit­ting the light-de­tect­ing rod and cone cells. The oc­to­pus has a larger and more light-sen­si­tive eye which, with its wiring the right way round, has no blind spot and great night vi­sion.

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