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With any task that requires periods of careful
observation, such as reading, your eyes can feel discomfort.
However, you may experience some avoidable discomfort such as
dry, red or tired eyes, blurred vision or headaches. The main
causes of eye discomfort are thought to be:
- a very dry or dusty atmosphere
- very bright light sources in your field of view
- screen flicker or drifting
- looking at near objects continuously for long periods
- focusing on objects that are rapidly moving or not stable.
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- Use blinds or curtains to reduce the glare
from windows.
- Keep your screen clean.
- Set the monitor at 0-15 degrees off the vertical. Start
at 0 degrees, then angle it if you find an angle preferable.
You will need to mount the monitor higher the less angle
you have. A more vertical screen is generally better for
reflections and for head posture.
- Set up your screen so there is no bright light source
either beyond the screen or reflecting into it. Have it
at right-angles to the window if possible.
- Look away from the screen every few minutes at a distant
object.
- If necessary, use a desk
light to illuminate
your documents to the same brightness as your screen.
- If your screen flickers, get it set to a faster refresh
rate (also called vertical frequency), of at least "72
Hertz". All modern computers are capable of this,
but many are delivered refreshing at only 60 Hertz.
85 Hz is
widely recommended. Consult the supplier or your technical
support people, or in Windows check Control Panel, Display
for the settings. If there are limited Settings options
available, try visiting the web site of the graphics
card
(not the monitor) manufacturer to download the latest drivers.
- The best distance between you and your monitor
for comfortable viewing is around 25 inches (63 cm), so
that your eye muscles do not have to work hard in a near-range
focus all day. If yours is much closer than this, check
for adequate desk depth (or pull it away from the wall and
let the monitor overhang), monitor age, quality and size,
and your eyesight.
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Eye tests
If you are classed as a computer user you are entitled to
a free eyesight test. Ask your Health
and Safety officer for
more details.
Note for bi-focal wearers:
If you wear bi-focal or vari-focal lenses you may find yourself
tipping your head back to read your computer screen through
the relevant part of the lens. This will cause muscle tension
in your neck. You can improvise by placing your computer screen
a little lower than is normally recommended, but it is worth
asking your optician for more advice: varifocals are available
with an extended mid-range zone suitable for computer use.
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See also:
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