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2008
ACM

Letterscroll: text entry using a wheel for visually impaired users

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Letterscroll: text entry using a wheel for visually impaired users
Four text entry techniques for visually impaired users are presented. LetterScroll uses a mouse wheel to maneuver a cursor across a sequence of characters, and a button for character selection. Keystrokes per character (KSPC) vary from 6.97 to 2.68. After extensive analyses and pilot testing, two variations were chosen for initial evaluation. Method 1 (M1) uses the mouse alone to enter text. Method 4 (M4) also uses the keyboard to access vowels. In a study with seven blindfolded participants, entry rates averaged 2.9 wpm for M1 and 4.4 wpm for M4. Error rates for both methods were about 3.4%. Keywords Visually impaired, text entry, auditory feedback, voice synthesis, mouse wheel ACM Classification Keywords H5.2. Information Interfaces and Presentation, User Interfaces: Input Devices and Strategies
Hussain Tinwala, I. Scott MacKenzie
Added 30 Nov 2009
Updated 30 Nov 2009
Type Conference
Year 2008
Where CHI
Authors Hussain Tinwala, I. Scott MacKenzie
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