In this video (4 minutes, 13 seconds duration; captioned), Fran Gentle, Lecturer in Vision Impairment at RIDBC Renwick Centre, talks about braille in the Asia-Pacific region and how Australia and New Zealand came to use Unified English Braille.
Alternatively, you can listen to this MP3 audio file
(56kbps; 4 minutes, 10 seconds; 1.65MB).