NETRA
Netra (Near-Eye Tool for Refractive Assesment) is a system for prescribing eyeglasses, created by a team of researchers at the MIT Media Lab, that utilizes a smartphone and a plastic lens attachment that costs only one dollar to build. A patient looks into the lens attached to the smartphone and runs an app that shows them parallel red and green lines. The user then uses arrow keys on the phone to adjust the image until the lines overlap, creating an eye prescription. The team has founded a start-up called PerfectSight that will sell the device in Asian and African markets.
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