Joel Kontinen
Why do we have two eyes?
"You have a spare one in case you have an accident, and the second reason is depth perception, which we evolved to help us hunt," said Dr. David Guyton, professor of ophthalmology at The Johns Hopkins University. But having two eyes would lead to double vision if they didn't move together in perfect synchrony. So how does the body ensure our eyes always work together?
That sentence without the word evolved is all right.
Dr, Guytoc goes on the explain: “To prevent double vision, the brain exploits a feedback system, which it uses to finely tune the lengths of the muscles controlling the eyes. This produces phenomenally precise eye movements", Guyton said.
Each eye has six muscles regulating its movement in different directions, and each one of those muscles must be triggered simultaneously in both eyes for them to move in unison, according to a 2005 review in the Canadian Medical Association Medical Association Journal. "It's actually quite amazing when you think about it," Guyton told Live Science. "The brain has a neurological system that is fantastically organized because the brain learns over time how much stimulation to send to each of the 12 muscles for every desired direction of gaze."
However, the ability is acquired, "Babies master it usually within three to four months of life," said Guyton.
This means that our eyes with their wonderful scenery are created by God.
Source:
Plackett, Benjamin, 2020. How do our eyes move in perfect synchrony? Live Science 22 June.
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