The new procedure involves inserting a tiny 2mm-square photovoltaic microchip, with the thickness of a human hair, under the retina. Patients then put on glasses with a built-in video camera. The camera sends an infrared beam of video images to the implant at the back of the eye, which sends them on to a small pocket processor to be enhanced and made clearer. The images are then sent back to the patient's brain, via the implant and optic nerve, giving them some vision again.