By Megan Verlee from NPR
Like a lot of smartphone users, Rolando Terrazas, 19, uses his iPhone for email, text messages and finding a decent coffee shop. But Terrazas' phone also sometimes serves as his eyes: When he waves a bill under its camera, for instance, the phone tells him how much it's worth.
Terrazas is blind, and having an app to tell bills apart can be a big help. For one thing, it means he doesn't have to trust clerks to give him correct change. Terrazas' daily life is full of useful technology like this, but it also has a downside: The more he uses technology, the less he uses Braille, the alphabet of raised dots that the blind read with their fingers.
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