The device includes a tiny digital camera in a pair of glasses and is priced at $100,000 per unit.
Images from the camera are translated into electrical signals.
The signals are sent to a receiver above the ear or near the eye.
This receiver sends signals via a tiny wire attached to a 1mm x 1mm chip that has been implanted under the eye.
The chip contains 60 electrodes that can cause electrical impulses to travel from the ganglion cells to the brain, where they are interpreted as vision.
Some formerly blind patients have been able to recognize simple objects, see people in front of them, and even read large print after learning how to interpret the light and dark transmitted by the device.
In the United States, the Argus II device was approved for use.
Researchers are working on upgraded models that incorporate up to 1,500 electrodes to increase the resolution of the image produced.
The threshold of information that will be required for formerly blind patients to recognize faces is anticipated to be this.
Artificial retinas that can be implanted inside the eye are being worked on.
The scientists focused on figuring out how the ganglion cells transmit information to the brain.
They tested these codes in blind mice that had been genetically altered so that their ganglion cells were exposed to light.
The investigators didn't have to implant artificial retinas in the mice because they were exposed to different patterns of flashing light.
The results of the experiments showed that the mice were able to see at normal levels.
It is impossible to genetically engineer humans to express certain genes because of the major advantage of this approach.
Patients would wear a pair of glasses with an embedded camera, which would emit light that had been translated into the patterns the brain can understand, if that approach were successful.
This technology is exciting, but also expensive.
If this technology advances to the point where vision can be restored but also greatly enhanced, it will be possible.
A tiny camera can be used to send signals from a microchip in the artificial retina.
Nearsighted people use a lens to focus light rays on the retina.
Farsighted people use a lens to focus light rays on the retina.
People who can read the chart but can't focus on near objects are said to be the ones who have a shortened eye.
The image can be focused on the retina by increasing the bending of light rays.
The image appears fuzzy when the lens is not perfect.
This condition can be corrected by an unevenly ground lens.
Many people with visual focus problems are choosing to have laser-assisted in situ keratomileusis, or LASIK, instead of wearing glasses.