In a nutshell
Extra fine eyelashes can grow behind the normal lash line at the eyelid margin. Distichiasis may be congenital or develop after inflammatory changes. Some people notice little, while others experience tearing or a foreign-body sensation when the lashes touch the eye.
Why does it happen?
The extra hairs emerge from Meibomian gland openings, where eyelashes do not normally grow. They do not necessarily all point inward, but their position can allow them to touch the cornea; this differs from ordinary lashes that simply grow in the wrong direction.
Frequency
An extra row of eyelashes is a rare variation. Congenital and acquired forms are recorded differently; no single population rate is given here.
Frequency is a qualitative description, not your individual probability.
Is it normal?
It can be asymptomatic when there is no irritation.
When to seek advice
Have light sensitivity, pain, redness, or worsening vision checked by an eye specialist.
Does this happen to you?
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Sources (1)
- Singh: Distichiasis – An update on etiology, treatment and outcomes (opens a new tab)
Overview of extra eyelashes at Meibomian gland openings and corneal irritation.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
