Google has just released a new app, the Voice Access Beta, which massively improves on the accessibility features on Android devices for visually impaired users allowing them to control their Android devices using their voice only.
The Voice Access app would users to open apps using their voice for instance a user can launch the Chrome app by saying Open Chrome or return to the homescreen by saying Go home and scroll up or down using the Scroll Up or Down phrase. The app could also be used to Toggle the Bluetooth, Wi-Fi, navigating screens, among others.
To download the Voice Access app head over to https://g.co/voiceaccess (the Beta access is closed at the moment, although you can download the app from APKmirror ) or alternatively you can download the app from APKmirror
Source: Google Blog