HAVING trouble reading your cellphone’s screen? If that’s because you need glasses, your phone itself could be used tell you what strength lenses you need.
Ramesh Raskar of the Camera Culture group at the Massachusetts Institute of Technology has devised a method of providing basic eye tests using only a smartphone and a specially designed eyepiece. It could provide a home-based eye test for millions of people who cannot easily access regular optometry services.
Raskar’s Near-to-Eye Tool for Refractive Assessment (Netra) consists of a viewer that fits over a cellphone’s screen combined with software running on the phone. To test a person’s eyesight, the phone displays…
