If you've ever wondered what goes on when you rub your eyes, one person has revealed all in an MRI scan.
Sharing a video on Reddit, the clip shows exactly what happens when someone rubs their eyes and people are loving it.
You can watch it below:
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"This is what eye rubbing looks like through an MRI scanner," the post explains.
The clip begins with a person rubbing their eyes, before switching to an MRI scan, showing an eyeball wobbling back and forth.
A second MRI shows two eyeballs, which appear to move in their socket as the person rubs their eye.
And people are pretty mesmerised by the clip, with the post attracting hundreds of comments from other users.
One person wrote: "It’s basically massaging the back of your eye sockets with your eyeballs, worth it."
While another said: "What did i just see?! rubs eyes in disbelief."
And a third added: "I was rubbing my eye when I saw this."
Others said it had put them off ever rubbing their eyes again, admitting to being a little squeamish over the clip.
"Never rubbing my eyes again. Thanks," commented one.
And another added: "As good as it feels to rub my eyes...I'm done now. That's awful."
While a third wrote: "Gross and weird. GROSS AND WEIRD!"
"That looks awful, but why do I have such a strong urge to do this when I'm tired?," asked a fourth.
Meanwhile one person said: "BTW I talked to my optometrist and she recommended never rubbing your eye. Like, just don't touch. Apparently the pressure can screw up your eye."
According to Healthline, you should avoid rubbing your eyes because you can damage them if you rub too hard or too often.
"Rubbing too hard or too frequently might damage the lens of your eye or the cornea," the site explains.
"This could result in vision impairment or an infection that needs medical attention. You should call your doctor right away if you experience: eye pain; light sensitivity; reduced vision; blurry vision; redness or inflammation; headache; nausea and fatigue."
Eye rubbing has also been linked to a condition called keratoconus, which occurs when your cornea gradually bulges outward into a cone shape. This can lead to blurred vision and may cause sensitivity to light, needing frequent changes in prescriptions and sudden clouding of vision.
Lucy Devine