1.16 Trichiasis

Date of last review:

22/6/2026

Date of next review:

22/6/2028

Date of publication:

17/8/2026

Differential diagnosis⁽¹⁾

Other causes of ocular irritation or red eye
Distichiasis
- in which an additional row of lashes arises from the Meibomian gland orifices, should be distinguished from trichiasis

Possible management by Optometrist

Advice ⁽¹⁾

Epilation of misdirected lashes using forceps
- Advise the patient that lashes typically regrow within 4–6 weeks, and epilation may need to be repeated
Where trichiasis is secondary to entropion, temporary symptomatic relief may be achieved by taping the eyelid
Consider a therapeutic contact lens (e.g. silicone hydrogel soft lens, rigid mini‑scleral or scleral lens) for short‑term corneal protection where appropriate
Advise lid hygiene where trichiasis is associated with blepharitis (see Community Eyecare Guideline 1.2 Blepharitis, Anterior and Posterior)

Treatment

Ocular lubricants for symptomatic relief as required (drops/gel for use during the day ± unmedicated ointment for use at bedtime) ^(1). Refer to local formularies for suitable options⁽⁶⁾

Note: Patients on long‑term topical medication may develop sensitivity reactions to active agents or preservatives. Consider switching to preservative‑free preparations as required ⁽¹⁾.

Typical dosage/duration

(Blue text = IP, black text = non-IP)

Not applicable for this condition ⁽⁷⁾

In cases of known sensitivities, please consult local formularies for alternative options ⁽⁷⁾.

Further management options ⁽¹⁾

Mild Trichiasis

Requires epilation only
Normally no referral required

More Severe Trichiasis

Associated with complications (e.g. corneal staining, recurrent epithelial defect) or secondary causes such as entropion
- Initial management in primary eye care, followed by urgent referral to secondary care where surgical intervention may be required

Possible management in secondary care or local/community pathways where available ⁽¹⁾

Electrolysis:
- destruction of individual lash follicles using electrical current; suitable for small numbers of lashes; may require repeat treatments
Cryotherapy:
- treatment of multiple lashes using a nitrous oxide cryoprobe; may be associated with skin depigmentation
Laser ablation:
- repeated laser application to the hair follicle
Eyelid surgery:
- for trichiasis secondary to entropion (e.g. everting sutures, lateral tarsal strip)
- in trachomatous trichiasis, full‑thickness tarsotomy with rotation of lash‑bearing tissue has demonstrated effectiveness

College of Optometrists Clinical Management Guideline⁽¹⁾ 

Trichiasis - College of Optometrists *

*With special thanks to The College of Optometrists for providing the evidence framework for diagnosis and management from the Clinical Management Guidelines (CMGs) for this condition. All references to the College/CMGs are included where appropriate and form the basis of the Community Eyecare Guidelines. 

Guidance is informed by the following sources  

College of Optometrists Clinical Management Guidelines Clinical Management Guidelines - College of Optometrists  
Advisory alignment with the College of Optometrists Formulary Optometrists' Formulary - College of Optometrists  
Advisory alignment with the BNF BNF (British National Formulary) | NICE 
Advisory alignment with the Summary Product Characteristics taken from the EMC Home - electronic medicines compendium (emc) 
Advisory alignment with Scottish Health Board formularies (where a clear majority is present) * 
Advisory alignment with expert consensus (CEGG), informed by sources 2-5 above 
Advisory alignment with expert consensus (CEGG)  
“Annex C of the Statement” https://www.eyes.nhs.scot/for-professionals/legislation/

* Scottish formularies should be available within the Prescribing section of your Health Board pages on the eyes.nhs.scot website. If unavailable, contact your local Health Board for further information; Health Boards landing page  

If you have a query relating to this page, please email NSS.ComEyecareGuidelineGroup@nhs.scot

Disclaimers

CEG disclaimer for guidelines awaiting update:

The Eyecare Guidelines area of the eyes.nhs.scot website (“Website”) is intended as a reference source for education and clinical decision support and is intended for use by ophthalmic healthcare professionals working in Scotland.

As such, the Eyecare Guidelines are not intended for use by the general public and do not replace the advice of a healthcare professional. Members of the public should seek advice directly from their optometrist.

Before reading the Eyecare Guidelines or making any management decisions based upon them, all users should read the ‘supporting information’ page which gives more detail around the content of the Guidelines and useful website links [link to Supporting Information page].

Users should note that that the Eyecare Guidelines guidance is not mandatory. The guidelines will not be suitable for every situation, and they are not intended to be a substitute for specialist expertise and clinical judgement. Users assume all responsibility for using/interpreting the information within the Eyecare Guidelines section of the website. Users should also note that the Eyecare Guidelines should not be adhered to in isolation and should be considered in conjunction with other national and locally available guidance/pathways.

Users should note that Guidelines which have not yet been updated should be considered with caution. Where the Eyecare Guidelines contain links to other sites and/or resources provided by third parties, these links are provided for information only.

Accordingly, to the maximum extent permitted by law, the Eyecare Guidelines are made available on the basis of excluding all representations, warranties, conditions and other terms (including, without limitation, the conditions implied by law of satisfactory quality, fitness for purpose and the use of reasonable care and skill) which, but for this disclaimer, might have effect in relation to the Eyecare Guidelines.

CEG disclaimer for updated guidelines:

Users should note that that the Eyecare Guidelines guidance is not mandatory. The guidelines will not be suitable for every situation and they are not intended to be a substitute for specialist expertise and clinical judgement. Users assume all responsibility for using/interpreting the information within the Eyecare Guidelines section of the website. Users should also note that the Eyecare Guidelines should not be adhered to in isolation and should be considered in conjunction with other national and locally available guidance/pathways. 

Updating the Eyecare Guidelines requires a continuous process; the date of the last review for each guideline will be clearly noted on each guideline. Users must consider these dates before using the guidance.

While the Common Services Agency (“PSD Scotland”) makes reasonable efforts to ensure that the information on the Eyecare Guidelines area of the Website is correct, the Website is provided ‘as is’ and PSD Scotland does not warrant the accuracy and completeness of the material on the Website. PSD Scotland may make changes to the Website at any time without notice. Some of the material on the Website may be out of date, and PSD Scotland makes no commitment to update such material. Users should note that some Eyecare Guidelines on the Website have not been updated for several years and should be considered with caution.

Where the Eyecare Guidelines section of the Website contains links to other sites and or resources provided by third parties, these links are provided for information only. PSD Scotland has no control over, and no liability in respect of, the content of these sites and resources.

Accordingly, to the maximum extent permitted by law, the Eyecare Guidelines area of the Website is made available by PSD Scotland on the basis that PSD Scotland excludes all representations, warranties, conditions and other terms (including, without limitation, the conditions implied by law of satisfactory quality, fitness for purpose and the use of reasonable care and skill) which, but for this disclaimer, might have effect in relation to the Website. 

1.16 Trichiasis

Date of last review:

Date of next review:

Date of publication:

Differential diagnosis (1)

Possible management by Optometrist

Advice (1)

Treatment

Typical dosage/duration

Further management options (1)

Possible management in secondary care or local/community pathways where available (1)

College of Optometrists Clinical Management Guideline (1)

Guidance is informed by the following sources

Disclaimers

CEG disclaimer for guidelines awaiting update:

CEG disclaimer for updated guidelines:

Differential diagnosis⁽¹⁾

Advice ⁽¹⁾

Further management options ⁽¹⁾

Possible management in secondary care or local/community pathways where available ⁽¹⁾

College of Optometrists Clinical Management Guideline⁽¹⁾ 

Guidance is informed by the following sources  