- by Dr Alok B S
- 1 Shares
- Jun 16 2017
Bionic Eyes-The new research-What is it and how does it work?
The retina at the back of the eye contains light identifying cells called photoreceptors. These cells transform light energy into electrical energy, which is transferred to the brain via various layers of retinal nerve cells. In many forms of blindness, such as retinitis pigmentosa and age related macular degeneration, the photoreceptors die but leave the other nerve cells unharmed. While those nerve cells cannot identify light themselves, they can respond to electrical trigger.
A bionic eye is fabricated from a formation of stimulating electrodes. The arrangement is placed onto the retina in the eye and fed signals from a digital camera. Digital cameras work by transforming light at each pixel in their sensor formation or arrangement into electrical signals that study the brightness of the light. These signals are then used to create an image on a display at the rear of the camera. Generally sighted people then detect that image using their eyes.
In a bionic eye, we escape the visual exhibit and send the electrical signals from each pixel in the camera to the arrangement of stimulating electrodes located on the eye. When placed into the eye of a visually impaired patient, the electrodes trigger the nerve cells that would normally acquire input from the absent photoreceptors. The nerve cells have no sense that the electrical triggers they are experiencing is coming through a man-made electrode formation: they understand the signals as if they were coming from normal photoreceptors. As an outcome, they send the details to the brain, which in turn experiences a sequence of electrical signals that duplicates those experienced via the naturally functioning eye.
Of course, this process is complicated and evolution of bionic eyes is technically taxing. Crucially, it requires a large proportion of knowledge about the retina and about how prosthetic tools cooperate with the retina. Most significantly, the research requires us to comprehend how the retina responds to inserted electrical charge. Not amazingly, in the last few decades’ vision scientists have been concentrated on understanding how photoreceptors and visual nerve cells react to light: most study has been focused on understanding normal visual function. Only in recent years, with the possibility of developing bionic eyes, have the electrical effects of the retina become a topic of engrossment to scientists.
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