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BrailleType Unleashing Braille over Touch
Screen Mobile Phones
Touch Interfaces
pleasant
Tactile feedback
loss of tactile feedback
Loss of physical stability
Difficult to select targets
Complex interactions
Familiar and simple.
BRAILLETYPE
Less and larger targets
Familar layout
Simple structured Interaction
Speed and
Timeouts
User Evaluation
15 blind users
24 to 68 years old
All but two text regularly
Only one had
previous
experience
with touch
screens
mobiles
Practice phase
10 to 15 minutes
Two users were
not able to write
with QWERTY
(VoiceOver)
Erase was
unavailable
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Participants
BrailleType
VoiceOver
2.11 1.45
VoiceOver
BrailleType
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Participants
BrailleType
VoiceOver
14.1 8.9
VoiceOver
BrailleType
Easy to
comprehend. * Easy to use. *
Quickly write
text.
Would use this
system.
BrailleType 5 (0) 5 (1) 3 (1) 3 (2)
VoiceOver 4 (2) 4 (2) 4 (3) 3 (1)
(Median, Inter-quartile Range)
BrailleType simpler
albeit slower
Users prefer simpler to
faster
Several close targets and
Split-tapping were the main
error causes
The Future
BrailleTab
Long term study
Extras
NAVTAP AND BRAILLETAP: NON-VISUAL TEXTING INTERFACES
Tiago Guerreiro, Paulo Lagoá, Pedro Santana, Daniel Gonçalves, Joaquim Jorge
RESNA 2008
