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19.PNE
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1987-04-22
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VDU SAFETY
**********
by Val Petersson
****************
Val Petersson retains all copyright to the article below. Many thanks
to VAL for allowing us to include it in this issue of STOSSER.
***************
This is my interpretation of the health and safety regulations for
VDU operators, i know most of you guys are home users but if you spend
half the ammount of time that i do at your STs keyboard then it might
be a good idea if you take a couple of the suggestions on board.
RADIATION
*********
The results of recent VDU radiation surveys have found radiation to be
way below international limits. Although if you have been adivised
to steer clear of radiation, you should not use a VDU, pregnant women
for example.
CATERACTS
*********
Recent test found no proof that VDU radiation causes cateracts. However,
if you already have cateracts, you should not use a VDU.
EPILEPSY
********
VDU work does not cause epilepsy and most sufferers can take part in VDU
work. Sufferers of Photosensitive Epilepsy should not use VDUs however
as the screen flicker can trigger seizures.
FACIAL DERMATITIS
*****************
Although VDUs do not cause facial dermatitis, sufferers can have their
symptoms increased in certain conditions. These effects can be
reduced by avoiding :
Low Humidity, High electrostatic charge and close proximity to the
VDU.
Humidifiers, antistatic carpets and ionisers can help reduce the
problems.
PHYSICAL HAZARDS
****************
Most of the the problems experienced by VDU operators are caused by the
fatigue resulting from:
1. EYE STRAIN
2. EQUIPMENT
3. ENVIRONMENT
4. POSTURE
Fatigue due to eye strain can be reduced by avoiding: Large screens
over 18" : Long periods without breaks : Refresh rates less than
50hz : Large ammounts of bright screen : High intensity text display
: Viewing at close range ( less than 300mm ) : Sideways viewing of the
screen. Also, you should not look at the screen continously, eye
strain can be releived by occaisionally focussing on more
distant objects.
Fatigue due to equipment can be reduced by ensuring that: Anti glare
equipment is used : Green screens ( or similar restful colour) is used :
Brightness or contrast are adjustable : The screen resolution
is high : Moveable or detachable keyboards are used : Printers are as
quiet as possible.
Fatigue due to environment can be reduced by : Putting curtains or
blinds at all windows : sitting 90° to daylight : Ensure, wherever
possible that the light comes from slightly above and behind :
Decorating walls in pastel restful shades : provide pictures and
plants for visual relief : Controlling temperature and room
humidity : using anti-static carpet and keeping noise levels low.
Fatigue due to posture can be reduced by : setting eye to screen
distance at 350mm to 650mm : placing screen below operator level at
an angle around 15° : Using a stable based, wheeled chair with rotating
seat : having clearance between desk and chair for thighs : having clear
space either side of the keyboard : use a forearm rest in front of the
keyboard : placing the keyboard in a position which enables the operator
with an angle of approx 80° between forearm and upper arm and with
forarm paralell to the floor( ??? ): feet can rest flat on the floor