Contact lens that will automatically adjust focal length (focus)

A company from Virginia filed a patent for a revolutionary contact lens that will automatically adjust focal length (focus) using liquid crystals.
The system consists of a contact lens, an “electro-active” element layer (the liquid crystals) attached to the lens, a view detector in electronic communication with the electro-active element, and an external power source.

Essentially, the view detector will use sources such as lasers, radio waves, microwaves or ultrasonic impulses to judge the distance from the object being viewed by the user. This information is communicated via a controller, which adjusts the amount of voltage applied to the layer of liquid crystals, which adjusts the index of refraction.

There are no information yet about where the power will come from and how the viewfinder will judge distances but one day it might work.