I'm used to seeing webcam lenses that look a bit like this:
But recently, I noticed that there are several webcams (especially Microsoft ones) that have some sort of "concentric recesses" around the camera lens, like in these images:
I don't know the technical name for this (if there is one), so I cannot find much information about it.
I believe it's related to lighting, but I wonder why I don't see this kind of "construction" in other kinds of cameras.