few days ago I installed my new Edge 91z. Everything is fine, except the fact that the screen has a weird glare we are not able to fine tune. I tried both the buttons on the monitor (the ones close to the switch on button), and using the "color optimization" in the advanced Intel graphic ad multimedia panel, but looking at the screen it's still tiring.
I found some review of the pc, and it seems they complain about the screen glare as well: "Glossy screen reflections." and "Sadly, this choice of material makes ThinkCentre Edge 91z prone to ambient light glare. "