For hundreds of millions in the developing world, clear vision means relying on an eye camp where trained volunteers can assess vision. However, the low chances of being seen don’t justify a day of missed work when living below the poverty line. Prescriptions are the only obstacle to clear vision for these people, as the cost of creating glasses has become so affordable. Eyecheck solves the problem of providing prescriptions using a smartphone app, standalone camera and server-side image processing. The app scans a long queue of people, pointing out those with healthy vision, and those who need urgent attention. For those with vision problems, a standalone camera is used to provide a prescription. The two devices work by shining different kinds light into the eyes and analyzing the reflections coming back.