Ophthalmology – Trichiasis

What the Disorder Represents

Trichiasis is misdirection of normally positioned eyelashes toward the ocular surface while the eyelid margin itself remains in a relatively normal position.

The lashes may rub against:

• Conjunctiva
• Cornea

and cause chronic mechanical epithelial injury.

This must be distinguished from:

• Entropion – the eyelid margin itself turns inward
• Distichiasis – an additional abnormal row of lashes arises from or near the meibomian gland openings
• Epiblepharon – a skin-muscle fold redirects otherwise normal lashes toward the globe

Why Trichiasis Matters

Persistent lash-cornea contact may cause:

• Foreign-body sensation
• Tearing
• Photophobia
• Superficial punctate keratitis
• Corneal abrasion
• Recurrent epithelial defects

Untreated severe disease may progress to:

• Corneal ulceration
• Neovascularization
• Scarring
• Infection
• Rarely perforation and permanent visual loss

How Trichiasis Develops

The most common mechanism is distortion of eyelash follicle orientation from:

Inflammation or scarring of the eyelid margin.

The lid itself may remain normally positioned while individual follicles rotate inward.

Common Causes

Important causes include:

• Chronic blepharitis
• Meibomian gland dysfunction
• Trachoma
• Ocular mucous membrane pemphigoid
• Stevens–Johnson syndrome / toxic epidermal necrolysis
• Chemical injury
• Thermal injury
• Prior eyelid surgery
• Trauma
• Chronic conjunctival scarring

Some cases are idiopathic.

Important Modern Correction About Prostaglandin Analogues

Topical prostaglandin analogues commonly cause:

• Increased lash length
• Increased thickness
• Hypertrichosis

They are not a classic primary cause of true follicular trichiasis.

However, longer or more numerous lashes can increase ocular-surface contact when:

• Lid anatomy is already abnormal
• Mild entropion or cicatricial disease is present

Distichiasis – A Different Lash Disorder

Distichiasis refers to an accessory row of lashes emerging from:

• Meibomian gland orifices
• Posterior lid margin

It may be:

• Congenital
• Acquired after chronic inflammation or scarring

These lashes are often:

• Fine
• Lightly pigmented
• Soft

but can still abrade the cornea.

Acquired Distichiasis

Acquired distichiasis may occur with:

• Ocular mucous membrane pemphigoid
• Stevens–Johnson syndrome
• Chronic blepharoconjunctivitis
• Chemical injury

It reflects metaplastic change of:

Meibomian gland structures into pilosebaceous units.

Typical Symptoms

Patients commonly report:

• Foreign-body sensation
• Tearing
• Redness
• Burning
• Photophobia
• Intermittent blurred vision

Symptoms may worsen with:

• Blinking
• Dry eye
• Contact lens wear

What the Examination Shows

The key finding is:

One or more lashes touching the globe despite relatively normal eyelid-margin position.

Examine carefully for:

• Corneal touch
• Conjunctival touch
• Distribution of abnormal lashes
• Lid-margin scarring
• Entropion
• Distichiasis
• Blepharitis

Corneal Findings

Repeated mechanical trauma may produce:

• Punctate epithelial erosions
• Linear epithelial defects
• Corneal abrasion
• Focal infiltrate if secondary infection develops
• Chronic vascularization
• Scar

Fluorescein staining is useful for demonstrating:

Lash-related epithelial injury.

Why the Entire Eyelid Must Be Examined

A single obvious misdirected lash may not be the whole problem.

Look for:

• Additional fine lashes
• Distichiasis
• Posterior lamellar scarring
• Lid-margin keratinization
• Subtle entropion
• Symblepharon

The underlying mechanism determines the correct treatment.

When Cicatricial Disease Should Be Suspected

Concern for cicatricial disease is greater when there is:

• Multiple recurrent lashes
• Forniceal shortening
• Symblepharon
• Conjunctival scarring
• Lid-margin distortion
• Keratinization

Important causes include:

• Ocular mucous membrane pemphigoid
• Trachoma
• Stevens–Johnson syndrome
• Chemical injury

Ocular Mucous Membrane Pemphigoid

The modern preferred term is:

Ocular mucous membrane pemphigoid (OMMP)

rather than ocular cicatricial pemphigoid alone.

It is a chronic autoimmune cicatrizing conjunctivitis that may produce:

• Subepithelial fibrosis
• Forniceal shortening
• Symblepharon
• Entropion
• Trichiasis
• Severe dry eye
• Corneal failure

Why OMMP Is Important

If trichiasis occurs together with progressive conjunctival scarring, simply removing lashes is inadequate.

The underlying autoimmune disease requires:

Systemic immunosuppression

to prevent progressive ocular-surface destruction.

Conjunctival Biopsy in Suspected OMMP

Biopsy for:

Direct immunofluorescence

may demonstrate linear deposition of immunoreactants along the epithelial basement membrane.

However:

A negative biopsy does not exclude OMMP.

Sensitivity is imperfect and depends on:

• Biopsy site
• Tissue handling
• Disease activity

Clinical suspicion remains important.

Important Modern Correction About Blood Tests

Tests such as:

• ANA
• Soluble CD8
• TNF levels

are not routine diagnostic tests for isolated trichiasis or OMMP.

Diagnosis of OMMP relies mainly on:

• Clinical pattern
• Conjunctival biopsy with direct immunofluorescence
• Systemic evaluation where appropriate

Trachomatous Trichiasis

In endemic trachoma, repeated infection with:

Chlamydia trachomatis A, B, Ba, or C

causes conjunctival scarring.

This may lead to:

• Entropion
• Trachomatous trichiasis
• Corneal abrasion
• Pannus
• Corneal opacity

Trachomatous trichiasis is treated primarily by:

Eyelid surgery, not repeated epilation alone.

Distinguishing Trichiasis From Entropion

Trichiasis

• Lid margin position relatively normal
• Individual lashes directed inward

Entropion

• Entire eyelid margin rotates inward
• Most or all lashes may contact the eye

This distinction is essential because entropion requires:

Correction of eyelid position.

Distinguishing Trichiasis From Epiblepharon

Epiblepharon is most common in children and is caused by:

• Redundant skin
• Pretarsal orbicularis

which redirects lashes vertically or inward.

The lid margin itself is usually not inverted.

It often improves spontaneously with facial growth.

First Treatment Goal

The immediate priority is:

Stop lash-cornea contact.

This reduces:

• Pain
• Epithelial injury
• Risk of infection
• Progressive scarring

Lubrication

Supportive treatment includes:

• Preservative-free artificial tears
• Lubricating ointment

These reduce friction but do:

Not correct the abnormal lash direction.

Treating Associated Blepharitis

If blepharitis or meibomian gland dysfunction is present, treatment may include:

• Warm compresses
• Lid hygiene
• Management of MGD
• Topical or systemic therapy when indicated

Reducing chronic lid-margin inflammation may reduce:

Further follicular distortion.

Epilation

The simplest temporary treatment is:

Mechanical epilation with forceps.

It is useful when:

• Only a few lashes are involved
• More definitive treatment is being planned
• The patient needs immediate relief

Why Epilation Is Temporary

Epilation removes the lash shaft but:

Does not destroy the follicle.

Therefore lashes usually regrow within approximately:

4–8 weeks

although timing varies.

Repeated epilation is therefore palliative rather than definitive.

Electrolysis and Radiofrequency Ablation

For a small number of recurrent lashes, follicular destruction may be performed with:

• Electrolysis
• Radiofrequency ablation
• Electrocautery

A fine probe is directed into the lash follicle to destroy its germinal tissue.

Limitations of Follicle Ablation

Recurrence can occur because:

• Follicle destruction may be incomplete
• The lash may regrow from an adjacent follicle
• Cicatricial disease may continue to generate new abnormal lashes

Repeat treatment may therefore be required.

Laser Follicle Ablation

Laser techniques may be useful for selected localized lashes, including:

• Argon laser
• Other targeted laser modalities

Advantages include:

• Precise treatment
• Less surrounding tissue injury

but multiple sessions may still be required.

Cryotherapy

Cryotherapy can treat:

Larger groups of abnormal lashes

by freezing the lash follicles.

It may be effective in:

• Segmental trichiasis
• Distichiasis

but can damage surrounding structures.

Cryotherapy Complications

Potential complications include:

• Lid-margin depigmentation
• Skin necrosis
• Lid notching
• Loss of normal lashes
• Exacerbation of scarring

For this reason it is used selectively.

Surgical Follicle Excision

Persistent focal disease may be treated by:

• Direct follicle excision
• Trephination
• Segmental lash resection

These are useful when the offending follicles can be clearly localized.

Eyelid-Splitting Procedures

Diffuse or recurrent trichiasis may require:

Lid-margin splitting

to separate the anterior lash-bearing lamella from the posterior lamella.

This can be combined with:

• Cryotherapy
• Follicle excision
• Anterior lamellar repositioning

Anterior Lamellar Repositioning

When a larger segment of lashes is misdirected, surgery can reposition the:

Anterior lamella containing the eyelashes

away from the globe.

This is particularly useful in:

• Cicatricial trichiasis
• Recurrent disease
• Diffuse lash misdirection

When Entropion Coexists

If trichiasis results from true entropion, destroying individual lashes is not enough.

Definitive management should correct:

The eyelid malposition.

Options depend on:

• Involutional
• Cicatricial
• Spastic
• Congenital mechanism

Trachomatous Trichiasis Surgery

For significant trachomatous trichiasis, established procedures include:

• Bilamellar tarsal rotation
• Posterior lamellar tarsal rotation

The aim is to rotate the lash-bearing margin:

Away from the cornea.

Role of Bandage Contact Lenses

A bandage soft contact lens may temporarily protect the cornea in selected cases when:

• Lash trauma is significant
• Definitive treatment is delayed

However, it does not correct the underlying condition and introduces:

Microbial keratitis risk.

Managing Corneal Abrasion

If trichiasis has produced an epithelial defect:

• Remove or redirect the offending lash
• Lubricate aggressively
• Consider antibiotic prophylaxis when clinically appropriate
• Monitor epithelial healing

Persistent defects require reassessment for:

• Infection
• Neurotrophic disease
• Ongoing lash contact

Management of OMMP-Associated Trichiasis

In OMMP, treatment has two parallel goals:

1. Protect the cornea from abnormal lashes
2. Suppress the underlying autoimmune cicatrizing disease

Systemic agents may include:

• Dapsone
• Methotrexate
• Mycophenolate mofetil
• Cyclophosphamide
• Rituximab in severe/refractory disease

Therapy is usually coordinated with:

• Cornea/ocular-surface specialist
• Rheumatology or immunology

Why Topical Steroids Alone Are Inadequate in OMMP

Topical therapy may reduce surface inflammation temporarily but does not reliably stop:

Progressive subepithelial fibrosis.

Moderate or progressive OMMP therefore requires systemic immunomodulatory treatment.

Follow-Up Strategy

Follow-up depends on:

• Number of lashes
• Degree of corneal injury
• Underlying cause
• Treatment performed

Patients undergoing epilation often need repeat review because lashes may regrow within:

Several weeks.

What to Monitor

Monitor for:

• Recurrent lash contact
• Corneal staining
• Epithelial defects
• Corneal vascularization
• Scarring
• Infection
• Progressive conjunctival cicatrization

When Urgent Review Is Needed

Urgent ophthalmic assessment is appropriate with:

• Reduced vision
• Severe pain
• Significant photophobia
• Corneal infiltrate
• Persistent epithelial defect
• Corneal thinning
• Suspected ulcer or infection

Expected Outcome

Prognosis is generally:

Excellent when the abnormal lashes are identified and definitively treated.

Outcome is more guarded when trichiasis is part of:

• Severe trachoma
• OMMP
• Stevens–Johnson syndrome
• Major chemical injury

because the underlying cicatricial disease may continue to progress.

Major Complications

Untreated trichiasis may cause:

• Chronic punctate keratopathy
• Recurrent corneal abrasion
• Microbial keratitis
• Corneal vascularization
• Corneal scarring
• Thinning
• Rare perforation
• Permanent visual loss

High-Yield Takeaways

• Trichiasis is misdirection of eyelashes toward the globe despite relatively normal eyelid-margin position.
• It must be distinguished from entropion, in which the eyelid margin itself turns inward.
• Distichiasis is an additional abnormal row of lashes arising from or near meibomian gland orifices and is a separate entity.
• Common causes include blepharitis, trachoma, ocular mucous membrane pemphigoid, Stevens–Johnson syndrome, chemical injury, trauma, and prior eyelid surgery.
• The principal danger is chronic lash-cornea contact, which can produce epithelial defects, infection, vascularization, scarring, and visual loss.
• Fluorescein staining helps demonstrate mechanical corneal epithelial injury.
• Epilation provides rapid relief but is temporary because the follicle remains intact and the lash generally regrows.
• A few recurrent lashes can be treated with electrolysis, radiofrequency, or laser follicle ablation.
• More extensive disease may require cryotherapy, follicle excision, lid splitting, or anterior lamellar repositioning.
• Cryotherapy can be effective but may cause depigmentation, lid notching, loss of normal lashes, and additional scarring.
• If entropion is present, treatment must correct the eyelid malposition, not simply destroy individual lashes.
• Trachomatous trichiasis is best managed with lid-rotation surgery when significant.
• In progressive conjunctival scarring, always consider ocular mucous membrane pemphigoid.
• A negative conjunctival direct-immunofluorescence biopsy does not exclude OMMP.
• OMMP-associated trichiasis requires treatment of both the lashes and the underlying systemic autoimmune cicatrizing process.
• Lubrication and bandage contact lenses may protect the cornea temporarily but do not provide definitive treatment.
• Persistent pain, reduced vision, corneal infiltrate, or epithelial breakdown requires prompt evaluation for corneal ulceration or infection.