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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).
If you have a large monitor - 20 or larger - you should sit slightly further back. 3. Position the top of your screen level with your eyes. The ideal viewing height is to have your eyes level with an imaginary line across the screen, about 2-3 below the top of the monitor. This can be accomplished in one of two ways - either by either lowering your monitor or raising your chair.