What You Should Know About Double Eyelashes

Long, full eyelashes are often admired—and sometimes even celebrated in pop culture. But when someone appears to have “double eyelashes,” there can be very different reasons behind the look. 

In some cases, a second row of lashes is caused by a rare condition known as distichiasis. In others, the appearance of double lashes comes from cosmetic enhancements like eyelash extensions. While either scenario may look harmless, both can affect eye comfort and eyelid health depending on the circumstances. 

Understanding the difference between natural and artificial double eyelashes—and how to properly care for your eyelids and lashes—can help you avoid irritation and other eye-related concerns. In this article, we’ll explain what causes double eyelashes, when they may become problematic, and what steps you can take to support healthy, comfortable eyes.

Distichiasis is a genetic mutation that causes one or more eyelashes to grow from the posterior lid margin or ducts of the meibomian glands—oil-producing glands located along the inner (“wet”) edge of the eyelid. In simple terms, this means lashes grow from a place on the eyelid where they normally wouldn’t. 

When extra lashes develop along the upper eyelid, lower eyelid, or both, they are known as distichiae. If only a single extra eyelash is present, it’s referred to as a distichia. 

Distichiasis exists in two forms: 

In rare cases, distichiasis may be associated with a multi-system condition called lymphedema-distichiasis syndrome, which involves limb swelling in addition to a double row of lashes. 

For many people, distichiasis is harmless and does not cause noticeable symptoms. However, when extra eyelashes are particularly thick, stiff, or misdirected, they may rub against the eye’s surface and contribute to discomfort, irritation, or damage over time. 

For individuals who experience irritation related to distichiasis, an eye care professional may recommend removing the extra lashes. Traditional options such as electrolysis are sometimes used, but results may be temporary because misdirected eyelashes can grow back after several weeks. 

Other treatment approaches may include cryotherapy, which uses extreme cold to thin or eliminate lashes, or laser-based treatments. The most appropriate option depends on the severity of symptoms and should always be discussed with an eye care provider. 

Eyelash extensions are another common reason people appear to have double eyelashes. These extensions are applied by attaching individual artificial lashes to natural lashes using specialized adhesives. 

When applied and maintained properly, extensions can enhance the appearance of lashes. However, if proper precautions aren’t taken, they may lead to eye discomfort or irritation. Potential concerns include sensitivity to adhesives, buildup of debris along the lash line, or irritation caused by improper placement.

Tips for Maintaining Eyelash Extensions 

If you choose to wear eyelash extensions, following basic care guidelines can help support eye comfort: 

Thoughtful maintenance can help reduce unnecessary stress on both your lashes and eyelids.

If you’re interested in eyelash extensions, it’s important to prioritize eye safety alongside aesthetics. Attaching too many lashes—or using improper techniques—can increase the risk of irritation. 

The American Academy of Ophthalmology recommends several best practices for eyelash extensions, including: 

Understanding how the process works—such as eyelids being taped closed during application and the length of time required—can also help set realistic expectations and support safer outcomes.

Whether you have naturally occurring double eyelashes, wear eyelash extensions, or simply want to maintain healthy lashes, good eyelid and lash hygiene plays an important role in eye comfort. Cleansing the eyelid margins regularly can help remove oils, debris, makeup residue, and other irritants that may build up around the eyes over time. 

For daily maintenance, a gentle eyelid cleansing routine can help support overall eye comfort and keep the lash line clean—especially for individuals who wear eye makeup or extensions. Products designed specifically for the delicate eye area, such as Avenova® Eyelid & Lash Solution, offer a simple, everyday way to cleanse the eyelids without harsh ingredients or excessive friction. Avenova is an ultra‑pure, gentle antimicrobial cleansing solution that’s #1 doctor recommended and features pure hypochlorous acid. 

If your eyes are already feeling irritated, red, or uncomfortable, more targeted lid hygiene may be helpful. In those situations, Cliradex® products, available as a foaming cleanser or as an eye-area towelette, can be used to provide a deeper clean, particularly when lash-related irritation is present. Cliradex features terpineol‑40, the most powerful extract from tea tree oil, to help remove dirt and debris that can contribute to irritation. These products are often incorporated into eye care provider–recommended routines when eye discomfort develops. 

By understanding the causes of double eyelashes and practicing consistent eyelid hygiene, you can help protect your eyes and maintain lash health—whether your lashes are natural or enhanced.