When Smartphones Do a Doctor’s Job

A simple, cheap way to measure eyesight may face resistance.

The device, called the Netra-G, is based on some clever optics and software Pamplona came up with—a way to measure the refractive error of the eye using a smartphone screen and an inexpensive pair of plastic binoculars. The whole setup might cost a few dollars to make. It does the job of a $5,000 instrument called an autorefractor.

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