Let there be vision – And there were Retinal Implants
Posted by evolvingwheel on February 28, 2007
People who turned blind from retinal degeneration have got a recent improvement in their ability to see. An improvement in the implants have allowed scientists to embed four times more electrodes in the chap implant from before – and thus a 4-fold increase in resolution. The device, developed by Mark Humayun and his colleagues at USC consists of an array of hair thin electrodes in a tiny chip that is implanted in the retina. The scientific breakthrough has been with stacking the large number of electrodes in the tiny chip bed.
There are few important technological aspects of this development. One is the wireless transmission of the visual data to the chip after the video is processed by an instrumentation clipped to the belt on the waist. The electrical impulse is then transmitted to the electrodes that send electrical stimulus to the retinal cells. However, the hurdle is not just with the packing of thousands of electrodes but making the impulse work identical to the effect of light on the retina. How do they do that? May be they will soon find ways to tweak electrical signals that may trigger stimulations on retinal cells similar to that of light. Guess more research needs to be done on the behavior of the retinal cells, their properties, and their behavior. What type of cellular protiens are located over there and how do they behave to light?
Then comes the packing of electrodes. Nano electrodes may be. How do they stack them though? I have to do a bit more research on the video processing side too. Can something be done on the algorithm side? If more information can be sent by using optimized processing algorithm. Read the article [here].