Anyone know how to do this?

I see these things on the back of my headlights, one on the outer edge, and one somewhat at the middle. Like this:

Are those the adjustment screws or am I looking in the wrong place? I tried turning one, and it turned, but there was no difference in the elevation of the headlight angle. Am I missing something? arcade

2009 'P71' formerly of the Pullman Police Department, Pullman, Washington.
Paint Code LK.
Work in progress...