ergonomics of some basic input devices

2. ERGO
NOMO
work
law
“study of how equipment and furniture can be
arranged in order that people can do work
more efficiently and comfortably“.
It includes:
 Work load
 Work design
 Performance etc.

5. 
Wrong way :

Typing with one hand.
Fingers and wrist bent.
Shoulders not in rest position.

Results in :


•
Swelling of connective tissues.
Swelling of thumb.
Numbness in fingers.

Correct way:
•
•



Keeps wrists in line with forearm.
Don’t use wrist rest area in typing.
Use SPLIT KEYBOARDS.

7. 
Wrong way:
•
With bent elbows .
Over pressure on buttons.
Pivoting wrist while mousing.

Results in :
•
•
•
Pain in wrist.
Pain in joints of fingers.
Stretching of muscles.

Correct way :
•
•
•
•
•
Wireless or laser mouse.
Free movement of wrist.
Use SLANT mouse.

9. 
Wrong way:
•
Too much bent in neck
Tightly grasping

Results in :
•
•
Pain in neck
Pain in tendons
Isometric tension

Correct way
•
•
•
•
•
Putting on desktop
Using round table
Free movement of wrist