Ah, I get it now. ABorgardt is right - the back side of each map light lens (the side farthest from the windshield) uses plastic tabs to hold itself in place. Use a small screwdriver to pry the plastic tab toward the windshield slightly , and each lens will swing down.
Screws behind the lenses secure the EVIC to the roof.
Be careful not to break the tabs, although a replacement lens shouldn't be too expensive.
Ryan