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BrailleType Unleashing Braille over Touch
Screen Mobile Phones
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Touch Interfaces
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pleasant
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Tactile feedback
loss of tactile feedback
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Loss of physical stability
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Difficult to select targets
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Complex interactions
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Familiar and simple.
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BRAILLETYPE
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Less and larger targets
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Familar layout
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Simple structured Interaction
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Speed and
Timeouts
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User Evaluation
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15 blind users
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24 to 68 years old
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All but two text regularly
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Only one had
previous
experience
with touch
screens
mobiles
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Practice phase
10 to 15 minutes
Two users were
not able to write
with QWERTY
(VoiceOver)
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Erase was
unavailable
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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
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2.11 1.45
VoiceOver
BrailleType
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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
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14.1 8.9
VoiceOver
BrailleType
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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)
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BrailleType simpler
albeit slower
Users prefer simpler to
faster
Several close targets and
Split-tapping were the main
error causes
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The Future
BrailleTab
Long term study
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Extras
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NAVTAP AND BRAILLETAP: NON-VISUAL TEXTING INTERFACES
Tiago Guerreiro, Paulo Lagoá, Pedro Santana, Daniel Gonçalves, Joaquim Jorge
RESNA 2008