Computer ergonomics

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Computer ergonomics

• How to avoid pain and discomfort in your
• computer workstation

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Hardware mouse or trackball

• Mouse
• To move your cursor you move the mouse
• Not to big fits good in your hand
• Third button to double click is desirable
• Not always a scroller
• Ergonomic grip less mouse ?

• Trackball
• To move your cursor you scroll the red ball
• Left-click with the thumb is desirable
• Third button to double click
• Scroller

3
Hardware keyboard

• Not too big from typing to using mouse not too
  far
• Not too small enough space for every finger
• Evolution to ergonomic keyboards rest or
  neutral position of arms and hands

4
Hardware display (CRT)

• Display quality
• High contrast and high brightness
• Number of colours 24 bit is normal ( settings)
• Resolution 15" Monitors - Best at 640x480 or
  800x600 dpi
• 17" Monitors - Best at 800x600 or 1024x768 dpi
• High refresh rate (about 80 Hz) is desirable
• Large size of the display screen gtlt small size of
  the monitor
• Small dot pitch (space between to adjacent
  pixels) gt Sharp display
• Low radiation and heat generating

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Hardware display (LCD)

• Ergonomicly mostly better than CRT
• Lower radiation and heat generating
• Brighter and no flickering (but ghosting might
  happen)
• Display quality
• High contrast and high brightness (by increasing
  the backlight output)
• Number of colours 24 or 32 bit is normal (
  settings)
• Keep the set up resolution
• Low refresh rate accommended (about 60 Hz)
• Large size of the display screen gtlt small size of
  the monitor
• Small dot pitch (space between to adjacent
  pixels) gt Sharp display

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Hardware extra components

• Documentholder between your screen and keyboard
• gt prevents neck complaints
• Glare filter reduces the amount of light you
  squint
• gt prevents eyestrain and fatigue
• Feetrest an aid to good posture

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The user sound light

• Sound
• Not too loud, also the computer itself
• You can cancel enoying tunes
• Screen
• No bright light behind your screen
• No direct light in your screen avoid reflections
• Configurations of brightness and contrast
• according to your personal preferences

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The user position of the components

• Monitor
• Right in front of you
• Distance
• 50-70 cm of your eyes
• Height
• a little lower than your head
• 15-30 below your line of sight light slanting
• Chair must give support in the back
• Feet flat on the ground or on a feetrest

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Use it right!

• Arms next to body
• hand in one horizontal line with your elbow
• Mouse right next to keyboard
• no big repeated mouvements
• with your shoulder, elbow or wrist
• gt prevents RSI
• (Repetitive Strain Injury)
• Have enough breaks!

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!! Task Assignment !!
Learn more about computer ergonomics at
http//ergonomics.ucla.edu/ http//www.healthyco
mputing.com/