Question:
An extra row of cilia (eyelashes) arising posterior to the grey line is called?
An extra row of cilia (eyelashes) arising posterior to the grey line is called?
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Look for the term that means an extra, accessory row of lashes behind the grey line, not merely misdirected ones.
Updated On: Jun 23, 2026
- Distichiasis
- Tylosis
- Madarosis
- Trichiasis
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The Correct Option is A
Solution and Explanation
Answer: Distichiasis.
Step 1: Distichiasis is an accessory (extra) row of eyelashes that grows from the orifices of the meibomian glands on the posterior lamella of the tarsal plate, that is, posterior to the grey line.
Step 2: Because these lashes emerge behind the grey line, they often touch the globe and cause irritation.
Why not the others: Tylosis is chronic thickening of the lid margin. Madarosis is loss or absence of eyelashes. Trichiasis is misdirected lashes growing from their normal anterior site but pointing toward the eye, not an extra posterior row.
Ref: Medscape, Distichiasis Overview.
Step 1: Distichiasis is an accessory (extra) row of eyelashes that grows from the orifices of the meibomian glands on the posterior lamella of the tarsal plate, that is, posterior to the grey line.
Step 2: Because these lashes emerge behind the grey line, they often touch the globe and cause irritation.
Why not the others: Tylosis is chronic thickening of the lid margin. Madarosis is loss or absence of eyelashes. Trichiasis is misdirected lashes growing from their normal anterior site but pointing toward the eye, not an extra posterior row.
Ref: Medscape, Distichiasis Overview.
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