Hi guys, my father suffers of a low vision condition; he is blind except from one eye that use only 18% of the potential vision.
Beacuse of this he usually uses a magnifier (a big stationary device at home) that encrease the size of the letters text so he can easly read newspaper and digital device when it's possible. The problem turns out when he is not at home and can't use the magnifier, he has a lot of difficult to interact with digital devices due to the standard text font that is too small to read.

He got for some time a Galaxy s3 recently replaced with Huawei p9 lite. With the s3 he can easly read the contact list cause samsung app has a black background with high contrast and allow him to change the font to a bigger size.
With huawei and in general Andoird L or M all the apps have a white background including the default contact list app. I increased the size of the font to the maximum value avaiable but it still not enough clear for him (also beacuse I can not change the light color of the background to encrease the contrast for a better vision).

I'm looking for a solution to make the font bigger than the actuall size and to change the background color to a darker one.
I'm also trying to convince my dad to use only voice commands but he find it difficult to use. It's a difficult transition O.O for a non digital native!

I hope that you guys can help me to find a solution.

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