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This story is from the category Sensors
Date posted: 24/06/2010 Ever worried that your eyesight isn't good enough to read your cellphone's screen? As it turns out, it could prove the ideal device for conducting eye tests. That's the idea of Ramesh Raskar of the Camera Culture group at the Massachusetts Institute of Technology, who has devised a method of providing basic eye tests using just 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 an image ? which may appear as a pair of parallel lines, say ? on the screen, which the eyepiece converts into a virtual 3D display. The subject is then asked to focus on the image and use the phone's keyboard to adjust the lines so that they merge. The extent of the adjustment needed reveals the amount of correction the eye will require to focus clearly. That is translated in to dioptres ? a number which opticians can use to provide corrective lenses. See the full Story via external site: www.newscientist.com Most recent stories in this category (Sensors): 01/05/2013: Breath study brings roadside drug testing closer |
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