We build the rider and driver apps to work with the accessibility tools your phone already provides — screen readers, larger text and higher-contrast display settings — and we treat a barrier in the app as a bug rather than a limitation you have to work around.
If something is unusable or hard to use for you, tell support what you were trying to do and which assistive tool you use. That gets it to the people who can fix it, and reports like these are how the gaps actually get found.
For wheelchair-accessible vehicles and service animals, see the accessibility question about booking a ride.