Question about perception of colors around light sources

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SUMMARY

The phenomenon observed around distant light sources, such as car headlights and street lamps, is known as "optical diffraction." This effect causes the visible spectrum colors to separate and become noticeable, particularly when an object with a straight edge is placed between the observer's eyes and the light source. The diffraction pattern is a result of light bending around the edges of the object, leading to the perception of color separation. For further understanding, resources on optical diffraction are recommended.

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filipg
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When I look at a distant light source (like car headlights, or street lamp lights) I notice colors of the visible spectrum (as separated (as in after prism refraction)) immediately around it and it's not just around white light sources.

It becomes more obvious if you place something with a straight edge between your eyes and the light source and fix it so that you see only a bit of light coming over the edge of the object.

Why is this?
 
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OK, thanks!
 

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