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The Human: Eye and vision


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The Human: Eye and vision

  1. 1. the eye and vision
  2. 2. sightmajor sensehalf our brain dedicated to visionmajority of computer output
  3. 3. the eyewhat you can see pupil – the lens covering ‘hole’ into the eye iris – muscles to change lens shapebehind the scenes upside down image (lens inverts) cells to detect light (rods and cones) optic nerve – blind spot ... filling in
  4. 4. sensing light cones rods central peripheralcolour (3 kinds) grey only detail movement bright light dim light
  5. 5. focus and attentionfovea • centre of vision • mainly cones • pretty small => need saccadesperipheral vision • mainly rods • detect movement => catch attention
  6. 6. onCueintelligent ‘context sensitive’ toolbarsits at side of the screenwatches clipboard for cut/copysuggests useful things to do with copied date
  7. 7. onCue in action • user selects text • and copies it to clipboard • slowly icons fade inuser selects text 20 21 and copies23 to clipboard 22 it 25 24 20 17 7 7 3 7 slowly icons fade in the dancing histograms very useful a ing out some of the textile sites yo xs page at
  8. 8. plus ...two eyes – stereo vision – left & right visual fields ‘cross over’two channels – old – rapid reactions and primitive responses – new – conscious vision
  9. 9. what we really seesensation – direct impact of light on retinaperception – what we feel we see not the same – optical illusions
  10. 10. Optical Illusionsthe Ponzo illusion the Muller Lyer illusion
  11. 11. fooled?optical illusions – often odd eye positions, unusual imagesperception – designed for the real world – our brain tries to ‘make sense’ of sensationfor design?