CNN reports that "scientists, eye surgeons, professors and students at the University of Washington have been developing a contact lens containing one built-in LED, powered wirelessly with radio frequency waves." If this technology progresses, we could be looking at the development of contact lenses that provide captions on things the wearer sees or tracks the wearer's blood sugar levels. The prospect sounds incredible, but there are some concerns over the safety of such gadgets. The lens has been tested successfully on rabbits, but will have to be tested much more in order to be approved by the FDA.
It's all part of the race towards self augmentation, where we are all ultimately The Bionic Man.