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Generally, the preferred viewing distance is between 20 and 40 inches (50 and 100 cm) from the eye to the front surface of the computer screen (Figure 1). NOTE: text size may need to be increased for smaller monitors. Provide adequate desk space between the user and the monitor (table depth).
This guideline would be difficult to exceed in a home theater, with most vertical viewing angles in the 15-20 degree range. See the diagram below for an example. The THX cinema standards have no references to a best or optimal vertical viewing angle.