Do you have any trouble driving at night? Ever notice that the car lights in front of you create lines that zig-zag all over the road? They might blend together in one blurry mess?

Lots of people who see this when they drive at night think is normal, but it actually isn’t. If you see the road like this at night, then you likely have astigmatism in your eyes.

Astigmatism is when the cornea in your eye has a slight curve. The curve prevents light rays from meeting at a common focus, and as a result, you might see distorted images—like those weird lights when driving at night we’re talking about.

People without astigmatism have both the cornea and lens curved in a rounded shape. The rounded shape of the cornea and lens divert any light coming through, which make the image they see more sharp. That’s why these people won’t see the blurry lines.

If you don’t know what we mean, check out this image below. These pictures have caused some massive chaos on Twitter after @UnusualFacts6 posted it, showcasing the major differences between what people with astigmatism see and what people without it see.

With astigmatism:

Without astigmatism:

Crazy, right? People were completely shook to say the least. Those who see the image on the left couldn’t believe that wasn’t how other people saw cars at night.

“Holy sh*t I thought everyone saw the lines,” someone wrote. “When I was little I would squint to make ‘em longer to entertain myself, thought that was normal.”

“I had no clue this was a thing! Honestly just thought that’s how light worked!” someone else posted.

“You mean not everyone gets the streaky lines???” another person said in disbelief.

“This explains why a friend of mine doesn’t understand when I tell him “lens flare” is real life,” another person wrote. “He doesn’t see what I see every day. MIND BLOWN.”

If anyone is skeptical, someone even tested it out by looking at lights with and without their glasses: “Just removed my glasses and looked at a source of light and then put my glasses back on and I can testify that yes this is indeed accurate,” they said.

As someone with astigmatism, I can personally attest to this, and am equally blown away that not everyone sees those dang lines!

If you see the lines but aren’t sure if you have astigmatism, other symptoms of astigmatism include blurry vision, eyestrain, headaches, and difficulty seeing at night.

Chances are, if you think you have it you likely do. According to the American Optometric Association, most people have at least some degree of astigmatism. It typically occurs with other vision conditions like myopia (nearsightedness) and hyperopia (farsightedness).

Don’t worry, it’s not serious! If you think you might have astigmatism, the best way to find out is to pay a visit to your eye doctor, who will likely recommend you need glasses.

Do you have astigmatism? Do you see these blurry lines at night, or do you see the sharper image with no lines?