Light dawns as woman gets bionic eye
Source: Agencies |
August 31, 2012, Friday
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Print Edition
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A bionic eye has given an Australian woman partial sight and researchers say it is an important step toward eventually helping visually impaired people get around independently.
Dianne Ashworth, who has severe vision loss due to the inherited condition retinitis pigmentosa, was fitted with a prototype bionic eye in May at the Royal Victorian Eye and Ear Hospital in Melbourne. It was switched on a month later.
"All of a sudden I could see a little flash ... it was amazing," she said in a statement. "Every time there was stimulation there was a different shape that appeared in front of my eye."
The bionic eye, designed, built and tested by the Bionic Vision Australia, a consortium of researchers partially funded by the Australian government, is equipped with 24 electrodes with a small wire that extends from the back of the eye to a receptor attached behind the ear.
It is inserted into the choroidal space, the space next to the retina within the eye.
"The device electrically stimulates the retina," said Dr Penny Allen, a specialist surgeon who implanted the prototype.
"Electrical impulses are passed through the device, which then stimulate the retina. Those impulses then pass back to the brain (creating the image)."
The device restores mild vision, where patients are able to pick up major contrasts and edges such as light and dark objects. Researchers hope to develop it so blind patients can achieve independent mobility.
"Di is the first patient of three with this prototype device, the next step is analyzing the visual information that we are getting from the stimulation," Allen said.
The operation itself was made simple so it can be readily taught to eye surgeons worldwide.
Similar research has been conducted at Cornell University in New York by researchers who have deciphered the neural code, which are the pulses that transfer information to the brain, in mice.
The researchers have developed a prosthetic device that has succeeded in restoring near-normal sight to blind mice.
Dianne Ashworth, who has severe vision loss due to the inherited condition retinitis pigmentosa, was fitted with a prototype bionic eye in May at the Royal Victorian Eye and Ear Hospital in Melbourne. It was switched on a month later.
"All of a sudden I could see a little flash ... it was amazing," she said in a statement. "Every time there was stimulation there was a different shape that appeared in front of my eye."
The bionic eye, designed, built and tested by the Bionic Vision Australia, a consortium of researchers partially funded by the Australian government, is equipped with 24 electrodes with a small wire that extends from the back of the eye to a receptor attached behind the ear.
It is inserted into the choroidal space, the space next to the retina within the eye.
"The device electrically stimulates the retina," said Dr Penny Allen, a specialist surgeon who implanted the prototype.
"Electrical impulses are passed through the device, which then stimulate the retina. Those impulses then pass back to the brain (creating the image)."
The device restores mild vision, where patients are able to pick up major contrasts and edges such as light and dark objects. Researchers hope to develop it so blind patients can achieve independent mobility.
"Di is the first patient of three with this prototype device, the next step is analyzing the visual information that we are getting from the stimulation," Allen said.
The operation itself was made simple so it can be readily taught to eye surgeons worldwide.
Similar research has been conducted at Cornell University in New York by researchers who have deciphered the neural code, which are the pulses that transfer information to the brain, in mice.
The researchers have developed a prosthetic device that has succeeded in restoring near-normal sight to blind mice.
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