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An Artificial Eye That Can See in Delhi

Scientists say they have cracked the neural code in a mouse retina to create a device that restores near normal sight in blind mice. They have also claimed to decipher the same code in a monkey retina, boosting hopes for a major bionic breakthrough an artificial human eye that can see.

We can make blind mouse retinas see, and we are moving as fast as we can to do the same in humans, lead researcher Sheila Nirenberg, a professor at Weill Cornell Medical College in New York, said in a statement.

Current prosthetic eyes for humans have electrodes that stimulate the retina output cells, called ganglion cells, which are often left intact even when the rest of eye hardware is destroyed by diseases that cause blindness. But these stimulators only allow the blind to see rough visual fields. To restore normal sight, the researchers say artificial eyes must incorporate the code that allows the retina to translate signals from photoreceptors into meaningful images.

Not only is it necessary to stimulate large numbers of cells, but they also have to be stimulated with the right code, the code the retina normally uses to communicate with the brain, Nirenberg explained. This is the first prosthetic that has the potential to provide normal or near normal vision because it incorporates the code.

Nirenberg and her team say the mathematical equations of the code can be put on a chip and combined with a mini projector. The chip would convert images encountered by the eye into streams of electrical impulses, and the mini-projector would then convert the electrical impulses into light impulses. These light impulses would then trigger light-sensitive proteins which would be introduced into the retina ganglion cells by gene therapy to send the code to the brain, according to a statement from Weill Cornell.

The researchers tested this method on blind mouse retinas and reported that the chip restored near-normal sight.

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