The little-known iPhone feature that lets blind people see with their fingers

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Today is World Sight Day, and that got me thinking.

A few years ago, backstage at a conference, I spotted a young blind woman using her phone. The phone was speaking everything her finger touched on the screen, allowing her to tear through her apps. My jaw hit the floor. After years of practice, she had cranked the voice’s speed so high, I couldn’t understand a word it was saying.

And here’s the kicker: She could do all of this with the screen turned off. Her phone’s battery lasted forever.

Ever since that day, I’ve been like a kid at a magic show. I’ve wanted to know how it’s done. I’ve wanted an inside look at how blind people can navigate a phone that’s basically a slab of featureless glass.

I finally got my chance. Joseph Danowsky offered to spend a morning with me, showing me the ropes.

Joe majored in economics at the University of Pennsylvania, got a law degree at Harvard, worked in the legal department at Bear Stearns, became head of solutions at Barclays Wealth, and is now a private-client banker at U.S. Trust. He often commutes to New York from his home in New Jersey.

Joe was born with cone-rod dystrophy. He can see general shapes and colors, but no detail. (Only about 10 or 15 percent of visually impaired people don’t see any light or color at all.) He can’t read a computer screen or printed materials, recognize faces, read street signs or building numbers, or drive. And he certainly can’t see what’s on his phone.

Yet Joe spends his entire day on his iPhone. In fact, he calls it “probably the number one assistive device for people who can’t see,” right up there with “a cane and a seeing eye dog.”

The key to all of this is an iPhone feature called VoiceOver. At its heart, it’s a screen reader—software that makes the phone speak everything you touch. (Android’s TalkBack feature is similar in concept, but blind people find it far less complete; for example, it doesn’t work in all apps.)

You turn on VoiceOver in Settings -> General -> Accessibility. If you turn on VoiceOver, you hear a female voice begin reading the names of the controls she sees on the screen. You can adjust the Speaking Rate of the synthesized voice.

There’s a lot to learn in VoiceOver mode; people like Joe have its various gestures committed to muscle memory, so that they can operate with incredible speed and confidence.

But the short version is that you touch anything on the screen—icons, words, even status icons at the top; as you go, the voice tells you what you’re tapping. “Messages.” “Calendar.” “Mail—14 new items.” “45 percent battery power.” You can tap the dots on the Home screen, and you’ll hear, “Page 3 of 9.”