Google TalkBack
it is a great way for the vision-impaired to use
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Hunter's comment
Most of us take being able to see everything on our high-resolution Androids for granted. We peep at pixels, discuss the merits of display technology to death, and even tend to turn our nose up at devices that don't have the ultra-high-res "true" HD screens some of today's flagships offer. But that's not the case for the large segment of us who have impaired vision.
Folks who have a hard time seeing the overload of information that a modern smartphone has to offer will need some assistance, and Google provides a really comprehensive set of tools in TalkBack. TalkBack is an Accessibility Service that helps vision-impaired users interact with, and enjoy, their devices. It uses spoken word, vibration and other audible feedback to let you know what's on your screen, what you're touching, and what you can do with it.
Link
https://play.google.com/store/apps/details?id=com.google.android.marvin.talkback&hl=en

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Google Talkback was an accessibility service for Android that helped blind and visually impaired users to interact with their devices. It made use of spoken words, vibration and other audible feedback to allow the user to know what is happening on the screen allowing the user to better interact with their device. The service was pre-installed on many Android devices. In 2017, it was replaced by Google with Android Accessibility Suite 6.2.
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