I am wondering how I could stop interference between 2 monitors on the same desk top. I have a 21″ and a 17″ monitor on the same desk and I can visibly see what I think is the screen refresh on each when I place them near each other, if I move themfar apart (one off the desktop) it goes away. I want to keep them together to reduce neck and eye strain. I thought about using a wooden divider or something (is a lead sheet overkill?). Any ideas on this? Are there products out there I can use? What type of material is best? If wood is how thick should I make the divider?