Feeling a stray eyelash enter the eye is a common experience that often prompts curiosity about where it goes and how the eye handles it. Understanding the eye’s anatomy explains what happens to these errant eyelashes.
Where Do Eyelashes Go?
An eyelash cannot get lost behind the eye due to the conjunctiva. This transparent membrane lines the inner eyelids and folds back to cover the white part of the eyeball (sclera). This continuous membrane forms a cul-de-sac, preventing any foreign object, including an eyelash, from traveling beyond the eye’s front surface.
Most eyelashes that fall into the eye either remain on the surface, often near the cornea or in the lower conjunctival sac, or become suspended within the tear film. They might stick to the moist surface or float freely in the liquid layer.
How Your Eye Naturally Clears Them
The eye possesses several natural defense mechanisms to expel foreign objects like eyelashes. Blinking plays a significant role in this process, acting like a tiny windshield wiper. Each blink helps to sweep the eyelash across the eye’s surface, moving it towards the inner corner of the eye, near the tear duct.
Tears also help clear the eye. Continuous tear production lubricates the eye and washes away irritants. The fluid can flush the eyelash out through the tear drainage system, or the eyelash may dissolve over time due to enzymes in the tear film. The combined action of blinking and tear flow effectively maintains eye health.
When to Be Concerned About an Eyelash
While most eyelashes are naturally cleared without issue, certain symptoms warrant concern and professional evaluation. Persistent redness of the eye that does not subside after a few hours may indicate ongoing irritation or a scratch. Any significant or worsening pain, especially if it feels sharp or deep, should also be assessed by an eye care professional.
Blurred vision, increased sensitivity to light (photophobia), or discharge from the eye are also signs that require attention. These symptoms could suggest a corneal abrasion, an infection, or another underlying issue. If an eyelash seems stuck or symptoms persist for more than a day, seeking prompt medical advice from an ophthalmologist or optometrist is advisable.