Patented 3M technology narrows the viewing angle so that screen data is visible only to persons directly in front of the monitor. Will not blur or distort on-screen images. Frame fits both LCD and CRT desktop monitors. Significantly reduces glare to help prevent eyestrain and headaches related to computer monitor use. Blocks up to 99.9 percent ELF/VLF E-field radiation when properly grounded. Reduces static and dust build-up when properly grounded. ADA approved.