Originally Posted by wodin

I got out a 10X jeweler's loupe and checked them out. It looks like the two on the right are connected together with another smaller "bubble" between (connecting) them. The one on the left is separated from them by about it's own diameter.

I'd say the connected ones comprise one sensor and the left one another.

Both the light sensor and the proximity sensor work I my phone, so if those connected ones were an anomaly they probably wouldn't.