Specific rules and regulations regarding occupational health and safety of work in front of a computer screen monitor are to be found in the Ordinance of the Minister of Labour and Social Policy of 1 December 1998 on occupational health and safety of work in workstations equipped with computer screen monitor (JL No. 148, item 973). Organization of office work LEGAL BASIS
Lighting is one of very important factors of the work environment which have a direct influence both on the injury and illness threat of the workers and on the efficiency of work. Inappropriate lighting of the place of office work results in sore and tired eyes and mental and nervous fatigue of the workers.
Lighting should ensure comfort of visual work.
LIGHTING – A FACTOR OF THE WORK ENVIRONMENT Lighting of the office rooms
Regardless of daily lighting, workrooms should be equipped with e l ectric light whose intensity should be adapted to type of works performed and precision they require.
Lighting with artificial light rooms of office work which are joined as well as rooms designer for general interaction (e.g. corridors, halls, stairs) should not differ in the intensity which could be dazzling in passages between the rooms. ELECTRIC LIGHTING Lighting of the office rooms
The required operating intensity of lighting in offices according to PN-EN 12464-1:2004 Lighting of the office rooms ELECTRIC LIGHTING Item Type of interior, tasks or activities Lighting intensity in lx 1. Filing, copying etc. 300 2. Hand-writing, typing, reading, data processing 500 3. Technical drawing. 750 4. Computer-designing workstations. 500 5. Appointments and conferences rooms. 500 6. Reception desk. 300 7. Records. 200
When a room is the room of permanent work, it is required, in case of using artificial lighting exclusively, to obtain an official agreement of an appropriate regional sanitary inspector, issued with approval of an appropriate local work inspector.
The temperature which guarantees full mental efficiency of a person and therefore right for ensuring comfort of office work, is 18 - 20 o C .
2. If the temperature in office rooms is between 21-25 0 C, employees are observed to be irritable and less hard-working. Mental efficiency is still satisfactory, however, the worker begins to make errors. 3. When the temperature in o ffice rooms is above 25 0 C, the workers feel dull, their mental efficiency decreases dramatically, difficulties with concentration appear and the num b er of mistakes they make increases significantly. Thermal environment of the office rooms TEMPERATURE
One of important parametres of the air in the work environment is its relative humidity, i.e. the ratio of the amount of vapour in the air to the maximum amount in a given temperature. Relative air humidity, showed in percentage values, affects working conditions in a significant way.
RELATIVE AIR HUMIDITY Thermal environment of the office rooms
Optimal conditions of air humidity depend, to a high degree, on the ambient temperature. The worker feels well in the following temperature:
18 - 20 o C – relative air humidity equals 40-50%;
25 o C – relative air humidity equals 35-40%
Thermal environment of the office rooms RELATIVE AIR HUMIDITY
The most frequent cause of giving shocks is poor technical condition of the wiring system in the rooms of office work as well as hygienic-sanitary and social rooms, which complement offices. Wiring system and electrical devices should be made and used in such a way as not to pose threat of giving a shock to workers or of fire. Wiring system and electrical devices
Installing and using too few sockets, especially when the number of office devices in constantly growing, is the reason for using extension cords and various adapters, which, in turn, poses very serious threats of:
giving a shock,
causing a fire through overloading leads and wiring system equipment (e.g. sockets) and causing sparks,
tripping and falling on extension cords lying on the floor in ways to and between workstation.
While equipping a workstation with a comput er , the employer needs to meet the fol l owing requirements:
symbols a n d icons on the screen should be clear and readable,
The picture on the screen should be stable, without any pulsation or other forms of instability,
brightness and c ontrast of an icon on the screen should be easily to regulate, depending on the lighting or a workstation,
regulations of monitor setting should allow to bend the screen, at least 20 0 back and 5 0 forward as well as to rotate at, at least, 5 0 forward as well as to rotate around its own axis at, at least, 60 0 towards right and towards left.
The keyboard should be a separate element of the basic equipment of a workstation.
The design of the keyboard must ensure that the worker sits in such position that it does not lead to hand muscles’ fatigue during work.
It should be possible to regulate the rake in the range between
0 0 and 15 0 ,
The surface of the keyboard should be mat and symbols on the keys should be readable and in contrasting colours.
KEYBOARD Equipping a workstation with a computer
The chair which constitutes an element of the workstation equipment should:
Be stable enough thanks to equipping it with at least five-cantilever base with wheels,
Have the right size of the back and seat to ensure a comfortable position of the body and easy movement,
Include chair’s height regulation in the range between 40 cm – 50 cm counting from the floor (height of the seat should make it possible for the worker to place his/ her feet flat and at rest on the floor),
If the results of the medical examination (ophthalmological), carried out in the course of prophylactic health care show the need to use corrective glasses during work with the monitor by some worker, the employer is obliged to provide him/ her with these glasses – in accordance with the ophthalmologist’s advice.
Glasses (o r contact lenses) which the employer is obliged to provide, should be always changed for a new pair when, as a result of a successive medical examination, such change is advised by a ophthalmologist.
If a worker feels that glasses used by him/ her can no longer be used in working with the monitor (because of worsened state of his/ her eyesight), he/ she may request the employer to be referred to the eyesight examination, even if the date of planned periodic examination is distant.
Health protection GLASSES
ATTENTION!!! The employer is obliged to provide glasses to workers using monitor during their work, for at least half the daily working time. Health protection GLASSES
Work connected with using screen monitor is alternate with other types of work not overloading his/ her eyesight and performed in another body positions whereas no longer than 1 hour of continuous work with the s creen monitor or
There is at least five-minute break, calculated as working hours, after each 5-minute break, included, calculated into working time, and after every hour, just as it was the case with the computer screen.
BREAKS DURING KOMPUTER WORK Health protection
ATTENTION!!! It is prohibited to employ pregnant women for work with screen monitors for longer than 4 hours a day. WOMAN AT THE COMPUTER Health protection
Nowadays numerous young people, who work with the computer and for many hours have their eyes fixed on the computer screen complain about this syndrome.
During work with the computer eyes are wide open, more open than during book reading. Also, they blink less frequently while it is blinking which moistens the surface of an eye and removes dust and germs from it.
As a result, the eyelid does not distribute enough tears on the eye’s surface, and therefore the eye:
there i s a feeling of having sand in one’s eyes,
DRY EYE SYNDROME – A THREAT FOR EYES IN WORK WITH THE COMPUTER Hard times for eyes
Computer work, preformed daily for more than four hours, may be inconvenient and stren u ous because:
Intensive visual work may lead to eyesight ailments, headaches, fatigue and weariness,
Long-lasting immobilization may be a cause of back, shoulders and spine pain, and also of shallow breathing and slowing down blood circulation, particularly in legs,
Bad work organization, quick pace, deadline pressure, isolation during work, no support in difficult situations, all these may lead to stress, which in turn leads to tiredness, weariness, frustration or occupational burnout.
WORK WITH THE COMPUTER Worth knowing and remembering
You suffer from headaches, problems with eyes (sore eyes, running with tears etc.) – pay special attention to the lighting of the room, papers and documents, contrasts and refle ct ions on the screen as well as the distance and angle between your face and the computer screen,
You suf f er from back and spine pains and numbness of legs – pay attention to your workstation, particularly to your seat’s height, backrest’s position and footrest,
You feel psychic tension and tire dness – pay attention to how your work is organized, its pace, time pressure, team relationships.
Worth knowing and remembering WORK WITH THE COMPUTER