I heard about Seeing AI and gave it a try. It runs on iOS, and is phenomenal. If you or someone you know has low vision, it should be very helpful.
Aside: has accessibility been covered on MPU?
Edit: a little more detail:
Short Text
Speaks text as soon as it appears in front of the camera
Documents
Provides audio guidance to capture a printed page, and recognizes the text, along with its original formatting
Products
Gives audio beeps to help locate barcodes and then scans them to identify products
Person
Recognizes friends and describes people around you, including their emotions
Scene
An experimental feature to describe the scene around you
Currency
Identify currency bills when paying with cash
Light
Generate an audible tone corresponding to the brightness in your surroundings
Color
Describes the perceived color
Handwriting
Reads handwritten text