• For the nearest viewer, one-and-and-half times the height of the screen should be the minimum viewing distance, with two times being optimal. Conversely, for the farthest viewer, eight times the screen height should be the maximum viewing distance, with six times being optimal. (This is based on a standard Power Point presentation or video playback being the primary source material)

• If highly-detailed graphics and images are being displayed (for example, Excel spreadsheets, AutoCAD drawings and HD video), then the maximum viewing distance should be reduced (four times to six times the screen height) for the farthest viewer to clearly see the text

• For viewing angles, the maximum recommended field of view in the horizontal plane is 45 degrees each side of the screen, with 30 degrees on each side of the screen being optimal 

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