科学家发明能够查看邮件的隐形眼镜

　　Emails and text messages could be read on contact lenses linked to the internet, scientists believe.

　　Researchers constructed a computerised contact lens and demonstrated its safety by testing it on live eyes, and there were no signs of adverse side effects.

　　At the moment, the contact lens device contains only a single pixel, but the researchers see this as a "proof-of-concept" for producing lenses with multiple pixels which, in their hundreds, could be used to display short emails and text messages right before your eyes.

　　The researchers said the device could overlay computer-generated visual information on to the real world and be of use in gaming devices and navigation systems.

　　It could also be linked to the user's body to provide up-to-date information on glucose or lactate levels, which could prove medically important.

　　The contact lens created by researchers at the University of Washington and Aalto University, Finland, consists of an antenna to harvest power sent out by an external source, as well as an integrated circuit to store this energy and transfer it to a transparent sapphire chip containing a single blue LED.

　　One major problem the researchers had to overcome was the fact that the human eye, with its minimum focal distance of several centimetres, cannot resolve objects on a contact lens. Any information projected on to the lens would probably appear blurry.

　　To combat this, the researchers incorporated a set of Fresnel lenses into the device; these are much thinner and flatter than conventional bulky lenses, and were used to focus the projected image on to the retina.