How Many Eyelashes Do People Have?

Eyelashes are delicate hairs lining our eyelids. Despite their small size, these specialized hairs play a role in protecting our vision and sensing the immediate environment around our eyes.

The Typical Eyelash Count

The number of eyelashes a person has varies, but general ranges exist for each eyelid. On average, the upper eyelid typically has between 90 and 160 lashes, often growing in multiple rows. The lower eyelid tends to have fewer, generally ranging from 75 to 80 eyelashes.

Individual factors like genetics can influence the precise count. The upper eyelid often supports a greater number of lashes due to its larger size and deeper roots.

Why Eyelashes Are Important

Eyelashes serve as a protective barrier, shielding the eyes from various external elements. They function as tiny filters, catching dust, debris, pollen, and other airborne particles before they can enter the eye and cause irritation or infection. Eyelashes also help regulate airflow over the eye’s surface, which can minimize tear evaporation and help keep the eyes sufficiently lubricated.

Beyond physical protection, eyelashes are highly sensitive structures, akin to whiskers. Their sensitivity triggers a reflexive blink when an object approaches the eye. This rapid blinking action closes the eye before contact, preventing harm. The curved shape and specific positioning of eyelashes can also divert sweat, rain, and other moisture away from the eye, preventing their entry.

Eyelash Growth and Natural Variation

Eyelashes, like all hair on the human body, follow a natural growth cycle consisting of three distinct phases. The anagen, or active growth, phase, lasts approximately 30 to 45 days. During this period, the hair follicle is connected to a blood supply that nourishes the growing lash. About 40% of upper lashes and 15% of lower lashes are typically in this anagen phase at any given time.

Following the growth phase is the catagen, or transition, phase, which lasts about two to three weeks. In this stage, the eyelash stops growing, and the hair follicle begins to shrink and detach from its blood supply. The final phase is the telogen, or resting and shedding, phase, which can last for approximately 100 days. During this time, the old lash rests before it naturally falls out, making way for a new lash to begin its growth cycle.

Several factors contribute to the natural variation observed in eyelash length, thickness, and density among individuals. Genetics play a significant role in determining these characteristics, including the growth rate and natural curl pattern of lashes. Age can also influence lash growth. Hormonal fluctuations, such as those experienced during pregnancy, can affect eyelash density and growth. Overall health, nutrition, and stress levels can impact the health and appearance of eyelashes.