Scientists have created a "seeing machine" that offers sight to some blind people:
The project started 10 years ago when, to determine if Goldring had any healthy retina left, her doctors sent her to the Schepens Eye Research Institute at Harvard. Technicians there used a diagnostic device called a scanning laser opthamaloscope, or SLO, to look into her eyes.
The SLO projected a simple image of a stick-figure turtle past the hemorrhages inside her left eye that contributed to her blindness and directly onto the retina of one eye. She could see the turtle, but wanted more, and asked the technicians to project the word "sun."