StemCell Therapy

What do solar cells and blindness have in common?

Rasmus Schmidt Davidsen, a post-doctoral researcher at Danish Technical University (DTU), hopes to develop an implant containing thousands of small isolated solar cells thatcan be placed behind the retina of blind patients to give them their sight back.

There are over 2 million people worldwide who are blind because the photoreceptors in their eyes dont work properly. The function of photoreceptors is to absorb light and send electronic impulses to the brain. When the patient doesnt receive these impulses, he or she experiences blindness.

READ ALSO: The Danish app that lends eyes to the blind

Davidsen explained that the eyes photoreceptors behave very much like solar cells, so the team got the idea that they could use some of the expertise that he has from the field of solar cells to make a chip for blind people. Each solar cell would be the equivalent of 1 pixel in the artificial vision they are trying to create.

Getting enough light One of the first challenges is to get enough power from natural light.

Even the best solar cells are unable to generate enough power based on natural light, saidDavidsen.

We are also limited to an area of 3 x 3 millimetres into whichthe surgeon can insert the chip. We cant even use the entire area because there also has to be electrodes and holes so that tissue fluids can flow freely into the eye.

The light problem has fortunately been solved by other researchers who found that, for example, the light source can be installed in glasses such as those used in Google Glass.

At the moment, the team are working with fresh eye tissue from pigs supplied by Danish Crown. At the moment, were working on the first prototype implant. Time will tell whether it will be possible to detect a reaction from the nerve cells from the pigs eyes.

A promising but challenging project A senior doctor and clinical professor at the eye department of Aarhus University Hospital, Toke Bek, who is co-operating with DTU, has high hopes for the project but can also see many challenges ahead.

One of them is biocomplexity. It is quite likely that the tissue will reject foreign bodies, especially in the eye. But nano-technicians can make an implant that can be encapsulated into material that the tissue cant easily reject. And they can make it very small.

He added that the solar cells are able to make use of nearly 100 percent of the light.

All in all, it makes sense to continue work on the project. There are considerable advantages working in co-operation with DTU, Bek added.

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Danish project really may give eyesight to the blind - The Copenhagen Post - Danish news in english

This entry was posted on May 20, 2017 at 4:48 am and is filed under Eye Sight & Vision. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed. |