Do you use reading glasses? Have you ever left them at home? There are several apps that can transform your smartphone into a pair of reading glasses:
Magnifying Glass With Light - easily magnify text and use your camera LED light to make the words easier to read.
BigMagnify - the title explains it all
Over 40 Magnifier and Flashlight - reminds us what we can all expect when we pass the 4-0 in life