Spiders’ eyes have some similarities with ours, but are far simpler.

Their eyes are rigidly fixed on their heads and look in different directions outward and upwards and they overlap to give a wide view. They can see in one tenth of the light we need to see, because they have enormous lenses to let all the available light through to the large light gathering cells in the retina.

 

 

 

As well as being very sensitive to light, spiders react to very small movements, but they can only see for about 15 cm and so have no real appreciation of the world around them.