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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 time you can divide your viewing distance by 3 to get the minimum screen size-and by 1.5 to get the maximum screen size. So, for example, if you know the viewing distance in your room will be about 10 feet (or 120 inches), you can work out that a good TV size will be in the range of: