I worked many months making a couple of bank app accessible to visually impared people. Hard work. Luckly I had a team that would test every version until they could themselfs use the app correctly.

In the end I was so used to test apps in this mode,that I put a shortcut in my phone so I could used it with headphones while the phone was in my pocket in the subway, or while I'm driving so I don't take the eyes of the road.