Eyelash: Hairs lining the eyelid edges that protect the eye and frame the gaze.

Eyelashes are hairs growing from the upper and lower eyelids. They shield the eyes from dust and debris while triggering a protective blink reflex when touched.

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Lashes grow in up to six layers on each eyelid.
Upper lashes average 7-8 mm; lower lashes average 5-6 mm.
High sensitivity triggers the blink reflex upon touch.
Length is genetically determined, not by sex or ethnicity.
Kohl has been used since the Bronze Age to darken lash lines.

What it is

An eyelash is a hair that grows at the edge of the top and bottom eyelids. These hairs extend outward away from the eye surface. They form up to six distinct layers on each lid. This arrangement creates a barrier against dust and small particles. The roots contain many nerve endings. This makes the eyelid margin highly sensitive to touch. Even light contact triggers an immediate blink reflex. This action protects the eye from potential harm. Eyelashes also help reduce tear evaporation. They provide shade against bright light. Their length usually matches one-third of the eye width for optimal function.

History and origin

The term combines 'eye' and 'lash', referencing whip-like motion during blinking. Ancient Romans viewed long lashes as ideal. Pliny the Elder linked lash loss to sexual excess. He suggested women wanted them to show chastity. In Ancient Egypt, wealthy individuals used kohl to darken the lash line. This practice began in the Bronze Age. Modern cosmetics evolved significantly in the twentieth century. False eyelashes became popular in the 1960s. Pharmaceutical options emerged later with FDA-approved treatments in 2009.

What it means

Long, prominent lashes are widely considered beautiful across cultures. They create an illusion of larger, more gazing eyes. Studies link longer lashes to perceptions of health and femininity. However, this trait appears in both males and females. Hadza women traditionally trim their own lashes. The Meitei writing system includes symbols for eyelashes. Nonverbal communication uses slow blinking or fluttering. This gesture is often interpreted as flirtatious behavior. It plays a role in eye contact dynamics.

The science

Embryonic development occurs between weeks 22 and 26 of pregnancy. Lashes do not grow continuously like scalp hair. Individual variability stems primarily from genetics. Length does not differ by sex or ethnicity. Upper lashes average 7 to 8 mm regardless of background. Thickness varies, with Asian populations showing thicker diameters. Follicles develop before birth and cannot increase after. Lashes lack arrector pili muscles, making them static. Color may differ from head hair but tends to correlate. Aging causes significant decreases in length and thickness.

A drawing made by EveryFaceShape from what this page says. It is a diagram, not a picture of the real face guide.

Styling and care

People enhance appearance using extensions, false lashes, or cosmetics. Mascara and eyeliner emphasize the lash line. Curlers or perms increase visual prominence without changing length. Transplants can reconstruct lost lashes but require trimming. Growth serums utilize prostaglandins or peptides. Some products aim to improve health and length. Natural curvature varies among individuals. Cosmetics companies research signaling pathways for product development. Maintenance involves regular cleaning and occasional replacement of artificial additions.

Stye ( hordeolum ) after approximately 5 days.. Photo: Andre Riemann, Public domain, via Wikimedia Commons

Questions people ask about Eyelash

How many eyelashes do humans have?

The upper eyelid typically holds 90 to 160 lashes. The lower eyelid contains 75 to 80. Asians usually have fewer upper lashes than Caucasians. All follicles develop during embryogenesis. The number cannot increase after birth.

Do eyelashes vary by gender?

No, eyelash length does not vary by sex. Both males and females share similar average measurements. However, long lashes are often perceived as a feminine trait. This perception exists despite the biological similarity between sexes.

What is the function of eyelashes?

They protect eyes from dust and debris. They trigger a blink reflex when touched. They reduce tear film evaporation. They also shield the conjunctiva from excessive light. This multi-layered structure serves vital defensive purposes.

Can eyelashes grow back if removed?

Yes, they take seven to eight weeks to regrow. Constant pulling may cause permanent damage. Follicles remain intact unless severely injured. Transplants can restore lost lashes but require regular trimming.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Eyelash", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFaceShape rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.

Eyelash