After a sufficient number of attempts the pattern of weights stabilises and a particular sort of input (say an image of the digit 2, translated into electrons by a digital camera) reliably produces a particular sort of output.

ECONOMIST: Machine vision

On each image, the watch lets you input text and numbers, up to 24 characters with each image--so you can keep track of the names and phone numbers of people whose pictures you take, for example.

FORBES: Magazine Article

Instead of typing in a search query, copy (or drag) the image you are looking for from any web page and paste (or drop) it into the input field.

FORBES: Move up http://i.forbesimg.com t Move down

The output is then relayed into a 1.4 mm thick plastic waveguide lens with input and output hologram structures on the surface which squeezes the light down the waveguide and then two dimensionally expands the image back into the user's eye, creating an image that is then mixed into the real world.

ENGADGET: Vuzix designs Smart Glasses to look like sunshades, tout connected transparent display