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Too much contrast between the computer
monitor and the immediate visual field burdens the accommodative function of the
eyes and will likely lead to eye discomfort. A monitor positioned above eye level
causes a larger area of the eye to be exposed to the physical environment. Tears
evaporate easily and predispose the user to develop dry eyes and eye strain especially
if the air is dry or if air velocity is high. In contrast, a monitor placed too
low will lead to more bending of the neck and upper back causing neck-shoulder
discomfort. |
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Adjust the height of the monitor. Make
sure that the top of the monitor is at or below eye level. Ensure that you will
not assume awkward posture when viewing the monitor. For laptop computers, adjust
the angle of the monitor until you find the optimal setting for viewing. |
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Place the monitor at least 40 cm away
from the eyes. Hint: The optimal viewing distance corresponds to an arm's length! |
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Adjust the direction and angle of the
monitor to avoid or minimize glares and reflections. You may find it helpful to
position the monitor perpendicular to the light source. |
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Adjust the brightness and contrast of
the monitor for easy viewing. When necessary, adjust the character size to increase
readability. |
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Use blinds or curtains to control the
amount of light that will fall on your workstation. For light fixtures, use louvers
or covers to decrease reflected light on the monitor. |
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Avoid too much contrast between the monitor
and the surrounding visual field. You may want to dim the general lighting level
more than 300 lux. If you need more light for your desk task, use supplemental
lighting. |
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If you need glasses, you may consider
using the glasses designed specifically for the viewing distance of 40-50cm. |
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