Our Eyes Have A Natural Version Of Night Vision, New Study Says - Insight Trending

Our Eyes Have A Natural Version Of Night Vision, New Study Says

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Our Eyes Have A Natural Version Of Night Vision, New Study Says
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Our Eyes Have A Natural Version Of Night Vision, New Study Says

According to a new study, our eyes have in-built night vision mode which gives us a regular night vision which empowers us to see starlight and moonlight. The retina changes both the software and hardware of its light-sensing cells to create a night vision for itself. Retinal circuits that were thought to be unchanging and programmed for specific tasks are adaptable to different light conditions.

“To see under starlight, biology has had to reach the limit of seeing an elementary particle from the universe, a single photon,” said Greg Field, an assistant professor of neurobiology and biomedical engineering at Duke University. “It’s remarkable at night how few photons there are.”

Detecting motion with a single point of reference doesn’t work exceptionally well. In this way, the retinas of vertebrates have four kinds of motion-sensitive cells, each specifically responsive to a motion that is up, down, right or left.

“For complex tasks, the brain uses large populations of neurons, because there’s only so much a single neuron can accomplish,” Field said. In humans, these directional neurons account for about 4 percent of the cells that send signals from the retina to the brain. 

At the point when there is substantially less light available, a weak signal of motion from the ‘up’ neurons, combined with a weak signal from any of the other directional cells can enable the mind to sense movement, like the manner in which it interprets two directional signals as being a motion that is something in between.

The loss of motion perception is a typical complaint in human patients with serious vision loss. Field said this finding in regards to the flexibility of retinal neurons may help the design of implantable retinal prosthetics later on.


Source: Duke

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