My wife has MS, and is registered blind (although partially sighted). We went to a national exhibition for aids and adaptations last year, and it seemed every ****er and his dog had some "special" aid, which in reality was a crippled tablet/phablet/phone running Android, with a few custom apps.
All of which was priced about 10x what it would have cost if you wanted the same thing *not* designed for the blind.
The only thing we got which was of any use, was "Cocoons" - a pair of sunglasses which reduce the glare my wife experiences due to the optic neuritis.
Meanwhile, back in the real world, 2 years after I looked into using voice control for android, and deciding to wait until we had a decent phone (not a Wildfire) we get a Moto G (*Brilliant* btw) and I discover that **** all has moved on in the world of Android voice control. It's still pants.
To be fair this is voice control via bluetooth. If you start researching you realise that no one has ever, in the history of the world, wanted to use a BT headset to control their phone. The crushing irony is, my *Windows 8* phone, has seamless BT integration.