Tests can also include an autorefractor, where a light is shined into the eye, and a keratometer to measure the curve of your cornea.

While a normal eye is perfectly round, people with astigmatism have egg or oval-shaped eyes, like a football - an American one.

Whether its first thing in the morning or late at night, approximately one-third of Americans face being subject to symptoms including the need to squint to see clearly, headaches, trouble seeing at night and blurry vision.

You can find out for certain if you have astigmatism by going to the opticians for an eye exam, where testing might include reading from an eye chart or looking through a device known as a 'phoropter', where you have to relay which letters you can see better.

VEZOS teams up with the industry’s leading road line controller developers, in order to offer its clients the top of the line monitors for long line road marking applications. Skip Line is a USA company, with 40 years of experience in the industry.

The image, shared on the subreddit r/InterestingAsF*ck, shows light emerging in straight lines from lights all over the room. It captures what some people would have likely seen while at the event, though not everyone.

Those who do see lights like this likely have a condition called astigmatism, which happens when when your cornea (the clear front layer on the eyeball), or your lens (inside your eye) has a different shape than normal.

A mild astigmatism likely won't result in any symptoms, but the abnormal shape of the lens or cornea caused by the condition can make light bend as it enters your eye, causing a refractive error.

"I always thought this was normal," one person wrote on Reddit after seeing the photo. "Like when it rains at night I [would] look at the street lights and they would look like big red and green stars stretching further because of the [rain] drops on the windshield. Then I found out I have astigmatism, crazy to think not everyone sees the glare."

Doctors don't know why the shape of the lens or cornea can vary between people, but the risk of getting it is inherited from parents.

Emily Brown is UNILAD Editorial Lead at LADbible Group. She first began delivering news when she was just 11 years old - with a paper route - before graduating with a BA Hons in English Language in the Media from Lancaster University. Emily joined UNILAD in 2018 to cover breaking news, trending stories and longer form features. She went on to become Community Desk Lead, commissioning and writing human interest stories from across the globe, before moving to the role of Editorial Lead. Emily now works alongside the UNILAD Editor to ensure the page delivers accurate, interesting and high quality content.

It's this latter symptom which can might cause you to see beams spreading from a light source, just like the lights caught in this particular photo shared on Reddit:

If you do have the condition, your doctor can treat it with glasses or contact lenses, or even with surgery which changes the shape of your cornea.

Ever wondered why you see beams of light coming from basically any lightbulb you come across? Well you, my friend, are likely part of the population with a very particular condition.

Astigmatism is common, with some people born with the condition while others develop it after an eye injury, disease or surgery, the Mayo Clinic explains.