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Telescopic Contact Lens For Visually Impaired People

See far distance just by winking your eyes. A team of engineers have designed a telescopic contact lens that can switch between normal and magnefied vision. 
The Researchers at  San Jose, California has built a prototype pf lens that could one day help people with visual impairment  to see. The lenses might be particularly useful with age-related macular degeneration, a debilitating condition in which people gradually lose their central vision. It is the leading cause of visual impairment and affect millions worldwide.
The contact lens developed by Ford’s team is one millimeter thick. Researchers used aluminum mirrors, fit tightly together, to create a ring-shaped telescope embedded in the contact lens. The center of the lens allows for normal, non-magnified vision.  Its periphery, where the telescope is located, magnifies images 2.8 times.
Switching between normal and magnefied vision
Without the glasses, the contact lenses superimpose both normal and magnified images. With the glasses on, a liquid crystal shutter will switch open a window for normal or telescopic vision? Researchers are working on a hands-free switch that uses a low-power infrared LED to monitor when the user blinks with both eyes or winks with one eye to activate one of the two functions.

 The lenses of the 3D glasses contain liquid crystals, which switch the two sections of the telescopic contact lens on and off. The crystals change the way light is refracted onto polarized films embedded in the contact lens, so that only light with a certain orientation, or polarization, passes through the glasses to the contact lens, hitting either the telescopic portion of the lens, or the area designed for normal vision.
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