What if reading glasses could be made obsolete using a mobile eye-training game over a period of three months? This may sound like a ridiculous proposition, but it's the way GlassesOff is training 40-60 year-olds to ditch their reading glasses for good.

Glass by Google aims to revolutionize the way we interact with the world, by offering a layer of augmented reality to be displayed before our eyes. But Google's not alone, with several competitors in the field – one of which stems from an amalgamation of two Israeli companies.

The term "blind as a bat" is not only wrong, it is a complete contradiction, since few creatures see as well as bats. Their use of both sound and vision to locate objects gives them a wide advantage over other nocturnal flying predators.

The human eye has 600 times more sensors than the finger. Israeli inventor Zeev Zalevsky has decided to take advantage of that fact and created a bionic contact lens that can physically press images onto the wearer's eye.