Philips 105G7 User Manual page 50

VIS (Viewable Image Size)
The real screen dimensions that users can see measured diagonally. The VIS of a monitor is
always less than the so called screen size of a monitor. For example, the VIS of a 17-inch
monitor is only about 16 inches. It depends on the useful screen size of CRT and the opening of
a monitor's front cabinet.
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