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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).
End of discussion. Maybe you want to look at the center of the screen, but the angle of your chair is a component of where this is. If your head ends up tilted back 20 degrees, and your screen is 6 feet away, the center of the screen should be about 2 feet above your seated eye height.