The blink powered night vision contact lenses as the name suggests are contact lenses that are charged when we blink. Does that sound interesting? Yes, it does. These lenses let you see clearly in low-light by enhancing ambient light up to 200 per cent. These lenses make use of plasma technologies to remove the bulky and costly tubes used in the night-vision goggles. Conventional night vision goggles use a technology that is similar to a picture tube television screen. The limitation of both these systems is that the electrons have to pass a distance to produce a picture. This reason alone accounts for the long tube on most of the night-vision goggles and also the long depth of the television sets backwards. These lenses use a technology very similar to plasma screen televisions that allows the design to be thin. To attain the electric charge obligatory to carry out the process of light amplification a slight layer of neodymium-iron-boron (NdFeB) gel is applied to the external eyelid. NdFeB is a rare earth magnet which provides the magnetic field to produce an electric charge on the plane of the lens. When the user blinks, the NdFeB layer charges the contact lens and the light increases. These contact lenses hold a very great charge for some time, but they are recharged with every blink. These lenses surely fare well as compared to the night-vision goggles. These goggles on an average need 5,000 volts of electricity which is usually supplied by batteries. But that sounds so complicated. And these contact lenses remain functional and charged till you are using them. There is also no disorientation or loss of vision. And they definitely are more comfortable and more cost-effective.