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Asked by 534erbb42 to Hephzi, Imogen, Jen, Jennifer, Tom on 12 Mar 2015.
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Thomas Barrett answered on 12 Mar 2015:
So it is to do with quite a few things. First your eyes are in different places in your head so they see the same object from a slightly different angle. This means when you shut one eye it is one place and when you switch eyes the angle you look at the object changes. You can do that with your finger if you hold it close to your face 🙂 Also one eye tends to be more dominant, so like be right or left handed you have have a dominant eye (I am left handed and left eye dominant which is quite rare!). Your dominant eye is the eye that your brain uses the most for input.
To work this out:
Extends both arms, brings both hands together to create a small opening, then with both eyes open views a distant object through the opening. Then alternate closing the eyes or slowly draw the opening back to the head to determine which eye is viewing the object (i.e. the dominant eye)It could also be to do with we need both eyes to work out depth and without one of them your brain has a hard time working out exactly where everything is.
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Jennifer Rudd answered on 12 Mar 2015:
I always understood that what you see is an average location of something so closing one eye removes the averaging.
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Jen Machin answered on 13 Mar 2015:
This is to do with something called depth perception. I have a friend studying this! Each of our eyes actually sees a different image. They send these images to our brain, which puts them together to see a 3D image. This also allows us to tell how far away something is – it’s very clever! But it also means that if you close one eye, your brain isn’t getting the full picture that it normally gets when it combines the images from both eyes, so things look like they’re in different places.
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