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SymptomsIrritation and pain to eye[1]
Diagnostic methodSlit lamp

Trichiasis (/trɪkiˈsɪs/ trik-ee-AY-sis, /trɪˈkəsɪs/ tri-KEYE-ə-sis)[2] is a medical term for abnormally positioned eyelashes that grow back toward the eye, touching the cornea or conjunctiva, resulting in irritation to the eye.[1]

This can be caused by infection, inflammation or autoimmune conditions.[1] Other causes include congenital defects, eyelid agenesis and trauma such as burns or eyelid injury.

Repeated cases of trachoma infection may cause trichiasis.[3] It is the leading cause of infectious blindness in the world.[4]

Standard treatment involves removal or destruction of the affected eyelashes with electrology, specialized laser, or surgery. In many cases, removal of the affected eyelashes with forceps resolves the symptoms, although the problem often recurs in a few weeks when the eyelashes regrow. Severe cases may cause scarring of the cornea and lead to vision loss if untreated. Mild cases may not require treatment.

Posterior misdirection of normal lashes most frequently affects the lower lid.


  • Inferior punctate epitheliopathy
  • Corneal ulceration
  • Pannus

Other animals

Trichiasis in dogs is hair from the eyelid growing in the wrong direction and rubbing on the eye, causing irritation. It usually occurs at the lateral upper eyelid, especially in the English Cocker Spaniel.[5]

Trichiasis also refers to hair from a nasal fold rubbing on the eye. This type of trichiasis can be flattened by rubbing petroleum jelly onto it, but surgery is sometimes necessary for permanent correction.

See also


  1. 1.0 1.1 1.2 1.3 "What Is Trichiasis?". American Academy of Ophthalmology. 14 February 2022. Archived from the original on 2 March 2022. Retrieved 26 April 2022. {{cite web}}: More than one of |archivedate= and |archive-date= specified (help); More than one of |archiveurl= and |archive-url= specified (help)
  2. "TRICHIASIS | Meaning & Definition for UK English |". Archived from the original on 2021-04-10. Retrieved 2022-01-16. {{cite web}}: More than one of |archivedate= and |archive-date= specified (help); More than one of |archiveurl= and |archive-url= specified (help)
  3. Rabiu M, Alhassan MB, Ejere HOD, Evans JR (2012). "Environmental sanitary interventions for preventing active trachoma". Cochrane Database Syst Rev. 2 (2): CD004003. doi:10.1002/14651858.CD004003.PUB4. PMC 4422499. PMID 22336798.
  4. Burton M, Habtamu E, Ho D, Gower EW (2015). "Interventions for trachoma trichiasis". Cochrane Database Syst Rev. 11 (11): CD004008. doi:10.1002/14651858.CD004008.pub3. PMC 4661324. PMID 26568232.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. Gelatt, Kirk N., ed. (1999). Veterinary Ophthalmology (3rd ed.). Lippincott, Williams & Wilkins. ISBN 0-683-30076-8.

External links

External resources