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Health Administration
Prolong exposure to computer screens may cause temporary visual fatigue. Factors including
working environment, working habit and posture, screen flicker and blue light contribute to this
condition. To minimize visual fatigue certain adjustments can be made on the work stations or
using suitable computer screens with features that alleviate eye strain.
Environment
Visual fatigue is affected by the working environment. Glare reductions and appropriate lighting
situations help minimize this condition.
• Glare reduction
• Lighting
Glare can be reduced by
a) Changing position of any light source that is causing the glare
b) Fitting the light sources with appropriate diffusers or lampshade
c) Using curtains or blind on windows to minimize glare from direct sunlight
d) Adjusting monitor position to be perpendicular to the source of light or
windows.
e) Using an anti-glare screen - ThinkVision monitors have anti-glare surface
treatment that scatters light for a reflection-free work usage.
Adequate lighting is necessary to avoid glare and eye fatigue. Excessive or insufficient
lighting makes the display on screen harder to see. Generally, lighting level should not
exceed 750 lux and levels ranging from 300 to 500 lux are most appropriate for
computer desk work. Recommended lighting arrangement includes positioning work
stations away from direct sunlight or using overhead lighting with baffles or louvers that
reduces glare.
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Working Habits
Long exposures to computer screens may cause eye strain. Symptoms include headache,
burning eyes, blurred vision and discomfort. To minimize eye strain, computer users can adjust
working habits to let their eyes relax and recover.
• Break Times
Computer users should take some time away from the screen especially if working for
prolong hours. Generally, it is recommended to take short breaks (5 – 15 mins) after 1 –
2 hours of continuous computer works. Taking short and frequent breaks is more
advised than longer breaks.
• Looking at Distant Objects
Users often blink less when in front of monitor screen. To minimize eye strain and
dryness, users should rest the eye periodically by focusing on objects that are far away.
• Eye and Neck Exercises
Certain exercise reduces eye strain and prevent early onset of musculo-skeletal
disorders. It is recommended to repeat these exercises often. However, should
symptoms persists it is recommended to consult a physician.
Exercises for the eye:
1. Alternate looking up and looking down while keeping the body and head upright.
2. Slowly roll your eyes to look to the left and right.
3. Roll eyes to look at objects on the upper right corner and then on lower right. Do
same thing to look at objects on the upper left and lower left.
Exercises for the neck:
1. Relax arm at the side. Bend head forward to slightly stretch the neck. Hold for 5
seconds.
2. Relax arm at the side. Turn thead to the right. Hold for 5 seconds. Then turn head to
the left.
3. Relax arm at the side. Swing head to the left. Hold for 5 seconds. Then swing head
to the right.
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Working Posture
Appropriate working position helps minimize eye discomfort. Seating position and ideal
placement of monitor are essential for a comfortable working experience
• Seating Position
Placing the monitor too far or too close may lead to eye strain. Far viewing distance
causes users to lean forward to see small texts, which strain the eyes and torso. Close
viewing distance, on the other hand, strains the eye resulting from exerting more effort
to focus and also causes the user to sit in awkward body posture (i.e. tilting the head,
typing with outstretched arms, etc.)
Recommended viewing distance between the eye and the monitor screen is 1.5 x the
diagonal of the screen. Solutions in meeting this required distance in cramped office
situations include pulling desk away from wall or divider to make room for monitor,
using flat panel or compact displays placing the monitor in the desk corner, or placing
the keyboard in an adjustable drawer to create a deeper working surface.
ThinkVision monitors are design to maximize work space (e.g. having thin profiles,
compatible for ThinkCentre Tiny back mount, practical cable management, etc).
• Viewing Angle
Neck fatigue and pain may result from prolong turning of the head to see objects on the
monitor screen. To minimize this, position the monitor directly in front so the head,
neck and torso face forward to the screen. It is recommended that monitor should not
be more than 35 degrees to the right or left of the head.
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Monitors should also not be placed too high or too low as this contributes to awkward
posture which results to muscle fatigue. It
Reduce Flicker
Monitor flickers refer to repeated changes in monitor light intensity. It is caused by several
factors including but not limited to voltage fluctuations. Reducing flicker minimizes eye strain
and headaches. ThinkVision monitors allow users to use high frequency display modes that can
effectively reduce flicker.
Low Blue Light
Concerns on blue light affecting eye health have risen over the years. Blue light have wavelength
between 300 nm to 500 nm. The monitors have a factory setting that reduces blue light
emissions. Users can enable low blue light mode on these monitors from the OSD settings.
1ǃ Press
to open the main OSD menu.
2ǃ Us
er or to move among the icons. Select icon
function.
and press to access
Image Properties
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3ǃ User or to move among the items. Select
w Blue Light
Lo
function.
icon
and press to access
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