1. Your knees should be sent at comfortable angle and
greater than 90 degrees flexion when sitting in front of the
2. A well designed mouse should not cause undue pressure
on the wrist and forehead muscles.
3. Set the eye to screen distance that permits you to most
easily focus on the screen.
4. Changing posture at frequent intervals maximizes fatigue
when using a computer.
5. Place the keyboard in a position that allows the forearms
to be close to the horizontal and the wrists to be straight.
6. It is recommended that operators avoid spending more
than 5 hours a day on keyboard duties and no longer than 50
minutes per hour without a postural/stretching break.
7. To detect whether there are reflections from the desk
surface and asses the change in reflected glare from the
8. 10,000-12,000 keystrokes per hour is considered an
acceptable standard in typing.
9. Good posture is essential for all users of computers.
10. The solution is to increase the refresh rate of the monitor
at least 75hz.
• There are various health problems associated
with the regular use of computers, such as stress,
eyestrain, and injuries to the wrists, neck and
• Employers must take steps to protect employees
whose work involves the regular use of
What is Ergonomics?
• It is a discipline that studies the interaction
between human activity and the components of
this activity to develop systems that allow people
to work in conditions of optimal efficiency, safety
What is Computer Ergonomics?
• Is the discipline of matching the task to the
worker using the most appropriate equipment to
optimize human well-being and overall
•This can be simplified to “Modify the workplace,
not the individual”.
Neck slightly bent
and head almost
straight Eyes level with text
on the monitor
Hands and wrists
relaxed at side.
Feet and low
Consideration should be given to:
• The accessories required to operate properly
• The layout of the equipment on the desk
• The location of furniture in the room.
What are the things to consider in computer
•Work surface height
• Document holder
• Posture and the
• Glare and reflection
• Using a mouse