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Why do I see three 'beams' when I look to a distant light source at dark?

In the night, when I look at a distant light source (for example a street lamp a few hundred meters away) I do not simply see a spot but rather a spot which is surrounded by 'light beams'.

So instead of seeing the image on the left-hand side of the picture below I see the one on the right-hand side.

enter image description here

I know a similar effect also comes up by using camera lenses, even though I am not sure if the reason is exactly the same. Below, for example, is a picture with four 'beams' (Source:

enter image description here

So, why do I see with my own eyes three beams whereas with a camera there appear to be more?