A lens resembling an octopus eye has been created by US researchers. The sphere consists of hundreds of thousands of layers of plastic and could revolutionize cameras, telescopes and spectacles.
Traditional glass lenses use a curved surface to focus incoming light towards a central point. The stronger the lens, the more curved its surface must be and therefore the thicker and heavier it is. In nature, eyes avoid this problem by using materials whose density varies in a certain way.
More here in Nature.