1.
the eye and vision

2.
sight
major sense
half our brain dedicated to vision
majority of computer output

3.
the eye
what you can see
pupil – the lens covering ‘hole’ into the eye
iris – muscles to change lens shape
behind the scenes
upside down image (lens inverts)
cells to detect light (rods and cones)
optic nerve – blind spot ... filling in

4.
sensing light
cones rods
central peripheral
colour (3 kinds) grey only
detail movement
bright light dim light

5.
focus and attention
fovea
• centre of vision
• mainly cones
• pretty small => need saccades
peripheral vision
• mainly rods
• detect movement => catch attention

6.
onCue
intelligent ‘context sensitive’ toolbar
sits at side of the screen
watches clipboard for cut/copy
suggests useful things to do
with copied date

7.
onCue in action
• user selects text
• and copies it to clipboard
• slowly icons fade in
user 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
x's page at http://www.hiraeth.com/

8.
plus ...
two eyes
– stereo vision
– left & right visual fields ‘cross over’
two channels
– old – rapid reactions and primitive responses
– new – conscious vision

9.
what we really see
sensation
– direct impact of light on retina
perception
– what we feel we see
not the same – optical illusions

10.
Optical Illusions
the Ponzo illusion the Muller Lyer illusion

11.
fooled?
optical illusions
– often odd eye positions, unusual images
perception
– designed for the real world
– our brain tries to ‘make sense’ of sensation
for design?