A new discovery has led to the creation of liquid optical lenses.
Bruno Berge, physicist and inventor, has created liquid optical lens by a process known as electro-wetting. In this process, a water drop is deposited on a metal substrate and covered by a thin insulating layer. When a voltage is applied to the metal, it modifies the angle of the liquid drop.
The liquid lens is comprised of two liquids, water and oil; one is a conductor while the other is an insulator.
A variation in the voltage causes a change to the curvature of the liquid to liquid interface, which changes the focal length of the lens.
The lens has a large inverse focal length, high optical quality and can operate in a wide temperature range.
The use of liquids helps in low cost construction. There are no moving parts and therefore electrical consumption is extremely low. This new invention could revolutionize eye care in the future, making it significantly more affordable for individuals to use corrective lens and improve their eyesight.
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