via gigaom.com
Having got my first pair of bifocals recently, this two dollar smartphone add-on that tests vision just caught my eye. Pocketables recently picked up on the Netra, which was shown off in a at TEDxBoston event by Ramesh Raskar, Associate Professor of Media Arts and Sciences at MIT’s Media Lab. The Netra clips to a phone and users tap buttons on the touchscreen display until images seen in the Netra are aligned. The device can measure for nearsightedness, farsightedness and astigmatism.
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