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Technology for restoring vision is still at an other stage , but a young variety of retinal prosthesis allow blind rat to smell light , a field shows .
The fresh gadget was plant in the eyes of visually impaired rats . Exposing the prostheses to light elicited a response in the part of the blackleg ' brains involve in visual processing , investigator report online today ( June 18 ) in the journal Nature Communications . The gimmick offers promise for furbish up vision in degenerative disease of the heart .
A new kind of visual prosthesis, implanted under the retina of a rat’s eye, restores the animal’s sensitivity to light.
Inside the retina — the promiscuous - sensitive privileged level of the back of the center — cell predict photoreceptors win over light into nervous signals , much as a camera sensor converts light into digital signals . In disease like retinitis pigmentosa and age - relatedmacular degeneration , some photoreceptors are miss , but the rest of the retina is preserved .
There has been growing interest in develop visual prostheses that use light to stimulate the retina . " In these case , you could actually stimulate , with electrical pulsation , the retina , which is still bear on , " said subject area researcher Yossi Mandel , an oculist and post - doctorial scholar at Stanford University . " you could expend a television camera and stimulate the retina by electric pulses or else of by photoreceptors . "
Mandel and his colleagues developed a wireless prosthesis that projects camera images onto the retina using near - infrared light ( twinkle just outside the spectrum man can see ) . A solar cell plant beneath the retina exchange the light into galvanising current , which activates neuron in the retina . [ double : Eye Implant Restores Vision to Blind ]
In the current study , the researchers implanted their retinal prosthetic gadget in bum with degenerated retina . The squad smoothen visible radiation on the prosthetic machine and measured the responses in the vision area of the brute ' brains , bang as the visual cerebral mantle .
Exposure to light evoked responses in the visual cortex that resemble those in normal vision . " We found that we were able to make a signal in the retina [ using ] our prosthesis , and it shows activation of normal vision in the visual lens cortex , " Mandel told LiveScience . Interestingly , he said , they found that signals from the prosthesis could reach the lens cortex even faster than innate light signaling . on-going work will investigate whether the equipment enables the bum to see shapes and forms .
Otherretinal prostheseshave been successful in restore limited vision , even in humans . But Mandel and his colleague ' implant is completely wireless and extremely thin ( about half the heaviness of a human hair ) . The machine is also scalable ; it ’s able-bodied to fit many more pixels into the same - size area as current clinically approved retinal prostheses .
In a few yr , these retinal prostheses may be capable of restore vision in retinitis pigmentosa and geezerhood - related macular devolution , two of the leading causes of cecity in the westerly macrocosm . Current treatments may slow the onward motion of these disease , but no bed curative live .
