How does a “bionic eye” allow blind people to see?

The bionic eye consists of five main parts:

  • A digital camera built into a pair of glasses.
  • A video processing microchip built into a hand unit.
  • A radio transmitter that wirelessly transmits pulses to implanted receiver above the ear or under eye.
  • A radio receiver for sending pulses to the retinal implant.
  • A retinal implant with an array of 60 electrodes on a chip.

This entire system works on battery with video processing unit. After capturing the image Eg–tree in the form of pixels, the camera sends this image to the video processor. The function of the video processor is to convert the pattern of pixels into a continuous electrical pulses and send them to the radio transmitter on the glasses. These pulses are transmitted in radio form to the receiver under the subject's skin, by radio transmitter.

The receiver sends the pulses to the electrode array at the back of the eye. The array acts as an equivalent of the retina's photo receptors. The pulses stimulate the electrodes. The electrical signals generated by the stimulation of the electrode, travel as neural signals to the visual center of the brain. Thus, the problem of macular degeneration and retinitis pigmentosa, can be rectified by bionic eye. By bionic eye, the optical-neural pathways function similar to that of healthy eye. The brain interprets the signals as tree and tells the subject–You are seeing a tree.