http://eyenetra.com/netra-g.html
Vinod Khosla and others have invested in MIT Media Lab’s EyeNetra, a smartphone attachment that claims to diagnose nearsightedness, farsightedness and astigmatism. The device is positioned as a less bulky alternative to the Shack-Hartmann Wavefront sensor. A $2 eyepiece is clipped onto a phone. The user then clicks to align the displayed patterns. The number of clicks required to bring the patterns into alignment indicates the refractive error. Patients connect to corrective lens providers through a cloud based system. The technology provides access to eye exams in the developing world.
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