Eye Doctor Reveals Why You Should Never Apply Eyeliner on Your Waterline

An eye doctor has revealed why you should never apply eyeliner directly to your waterline.

Eyeliner is a staple of most women's makeup bags and, if you grew up in the 90s or 2000s, you probably layered it on with a vengeance.

But Dr Brittani Carver, an optometrist from North Carolina, has posted a TikTok video warning that it can cause damage to the area.

The clip, shared on Thursday and already watched more than 2.9 million times, was captioned "Why not to wear eyeliner on your waterline."

In the footage, Carver says: "This patient has worn eyeliner on her waterline since she was a teenager.

"The reasons eye doctors do not recommend to wear eyeliner on the waterline of your eye is because there are specialized glands there that produce and excrete oil.

"The oil should be an olive oil texture, but as you can see here it looks more like toothpaste. That means that these glands are obstructed and are not producing healthy tears."

The video shows Carver using a metal tool to squeeze the skin in the area, to treat a blockage known as Meibomian gland dysfunction.

The eye health website AllAboutVision describes Meibomian gland dysfunction as "one of the most common eye problems you've never heard of."

Numerous factors can contribute to its onset, such as age, ethnicity and wearing contact lenses.

However, the AllAboutVision page also stated: "Wearing eye makeup is another contributing cause of MGD. Eyeliner and other makeup can clog the openings of Meibomian glands. This is especially true if you don't thoroughly clean your eyelids and remove all traces of eye makeup before sleep."

On her TikTok page, Carver, who works at Better Vision Optometric Center in Fayetteville, explained that there was a treatment available for patients with clogged eye glands.

"We will do a procedure called Lipiflow to really clean out the glands. She will not have as healthy tears as others, but will be able to cry," she said.

Thousands of people commented on her video, expressing shock that their makeup could cause this problem.

Jess_Lynne joked: "Me getting out of bed to go wash my make-up off."

Bats Babeyyy wrote: "New fear unlocked."

Not everyone was convinced, however. Krista Lee Argall posted: "I mean this in the most respectful way, I'm still doing it."

Carver offered eyeliner lovers some hope too, explaining that applying it on the "lash line is fine."

Newsweek has reached out to Carver for comment.

File photo of a blue eye.
File photo of a blue eye. An optometrist has posted a TikTok video showing how eyeliner can block glands in your eye. Olga Ignatova/Getty Images