Voice is slow, but it can be sped up with vocal macros. One syllable/non-word noise commands.
There's also touch pads on the side of the smart glasses as another input option. And I could imagine some people liking little trackball-esque handheld controllers(like from the Black Mirror episode "The Entire History of You").
And there's also air gestures using cameras on the smart glasses to watch what your hands are doing.
I don't think any of these has the raw data input bandwidth that a keyboard has, and for a lot of use cases even a touchscreen could be better. But maybe that can be made up by the hands-free, augmented reality features of smart glasses.
There's also touch pads on the side of the smart glasses as another input option. And I could imagine some people liking little trackball-esque handheld controllers(like from the Black Mirror episode "The Entire History of You").
And there's also air gestures using cameras on the smart glasses to watch what your hands are doing.
I don't think any of these has the raw data input bandwidth that a keyboard has, and for a lot of use cases even a touchscreen could be better. But maybe that can be made up by the hands-free, augmented reality features of smart glasses.