Telescopic Contact Lens Gives Sight 3x Magnification Without Surgery
The main breakthrough is that this telescopic contact lens is just 1.17mm thick, allowing it to be comfortably worn.
Other attempts at granting telescopic vision have included: a 4.4mm-thick contact lens (too thick for real-world use), telescopic spectacles (cumbersome and ugly), and most recently a telescopic lens implanted into the eye itself. The latter is currently the best option currently available, but it requires surgery and the image quality isn’t excellent.
To create a 1.17mm-thick telescope, the researchers… had to be rather creative. The light that will be magnified enters the edge of the contact lens, is bounced around four times inside the lens using patterned aluminium mirrors, and then beamed to the edge of the retina at the back of your eyeball. The mirrors magnify the image 2.8 times, but also correct for chromatic aberration, resulting in a surprisingly high fidelity image.
To switch between normal and telescopic vision, the central (normal, unmagnified) region of the contact lens has a polarizing filter in front of it — and then the wearer equips a pair of 3D TV spectacles. By switching the polarizing state of the spectacles (a pair of active, liquid crystal Samsung 3D specs in this case), the user can choose between normal and magnified vision.
(via World’s first telescopic contact lens gives you Superman-like vision | ExtremeTech)