Entropion and Ectropion

Definitions & Overview - Lid Flip Flops

• Entropion: Inward turning of eyelid margin; lashes abrade ocular surface.
  • Symptoms: Foreign body sensation, reflex tearing, redness. Risk of corneal ulceration.
  • Types: Involutional (most common, age-related), Cicatricial, Spastic, Congenital.
• Ectropion: Outward eversion of eyelid margin; exposes palpebral conjunctiva.
  • Symptoms: Epiphora (punctal malposition), dryness, chronic conjunctivitis.
  • Types: Involutional (most common), Cicatricial, Paralytic (CN VII palsy), Mechanical.

⭐ Involutional entropion is often due to horizontal lid laxity, disinsertion of lower lid retractors, and overriding preseptal orbicularis oculi_._

Etiology & Pathophysiology - Why Lids Go Rogue

Entropion (Inward turning)

• Involutional (MC): Age-related.
  • Horizontal lid laxity (canthal tendon dehiscence).
  • Lower lid retractor disinsertion/attenuation.
  • Overriding preseptal orbicularis oculi.
• Cicatricial: Palpebral conjunctival scarring (e.g., trachoma, Stevens-Johnson syndrome (SJS), ocular cicatricial pemphigoid (OCP), burns).
• Spastic: Orbicularis oculi spasm (due to ocular irritation, post-op).
• Congenital: Rare (e.g., retractor dysgenesis, tarsal kink).

Ectropion (Outward turning)

• Involutional (MC): Age-related.
  • Horizontal lid laxity (medial/lateral canthal tendon laxity).
  • Orbicularis oculi weakness/atony.
• Cicatricial: Anterior lamella (skin, orbicularis) shortening (e.g., burns, trauma, skin diseases like ichthyosis, eczema).
• Paralytic: Facial nerve (CN VII) palsy → orbicularis oculi paralysis.
• Mechanical: Tumors or masses pulling lid margin outwards.
• Congenital: Rare (e.g., blepharophimosis syndrome, euryblepharon).

⭐ Overriding of the preseptal orbicularis oculi muscle across the tarsal plate is a critical factor in the pathogenesis of involutional entropion, especially during eyelid closure or forceful squeezing of the eyelids by the patient which can exacerbate the inward turning of the eyelid margin and eyelashes towards the globe, leading to symptoms of irritation and potential corneal damage if left untreated over a prolonged period of time, thus highlighting the importance of addressing this muscular imbalance in surgical correction strategies for this common eyelid malposition which predominantly affects the elderly population due to age-related degenerative changes in the eyelid structures including the canthal tendons and lower eyelid retractors, contributing to overall lid instability and malpositioning that requires careful assessment and tailored management approaches to restore normal eyelid function and alleviate patient discomfort effectively and prevent long-term complications associated with chronic ocular surface irritation from misdirected lashes or an unstable eyelid margin that fails to protect the eye adequately from environmental factors and maintain proper tear film distribution across the corneal surface for optimal vision and comfort of the patient seeking ophthalmological care for this condition which can significantly impact their quality of life if not appropriately managed by a skilled oculoplastic surgeon or general ophthalmologist familiar with the diverse etiologies and treatment options available for entropion and ectropion conditions affecting the eyelids and ocular adnexa in various patient populations across different age groups and underlying systemic or local disease processes that may predispose individuals to developing these eyelid malpositions over time requiring timely intervention to prevent irreversible ocular surface damage and vision loss in severe cases of chronic irritation and exposure keratopathy or corneal ulceration due to trichiasis or lagophthalmos respectively depending on the specific type of eyelid malposition present in the patient's clinical presentation at the time of examination by the eye care professional responsible for diagnosing and managing such conditions effectively using medical or surgical approaches as indicated by the severity and etiology of the entropion or ectropion affecting the patient's eyelids and overall ocular health status which is paramount in preserving vision and ensuring patient well-being throughout their lifetime journey with eye health and disease management strategies implemented by the healthcare system to address these common yet potentially debilitating eyelid disorders that can cause significant morbidity if neglected or improperly treated by inexperienced practitioners not fully versed in the complexities of oculoplastic surgery and eyelid anatomy and physiology which are essential for successful outcomes in managing these challenging clinical scenarios encountered in daily ophthalmology practice settings worldwide across diverse patient demographics and healthcare resource availability levels influencing the choice of treatment modalities employed by clinicians striving to provide optimal care for their patients suffering from entropion or ectropion and related ocular surface complications that may arise from these eyelid malpositions if not promptly and adequately addressed through appropriate medical or surgical interventions tailored to the individual patient's needs and clinical findings on comprehensive ophthalmic examination including assessment of lid laxity, retractor function, orbicularis muscle tone, and conjunctival or skin integrity to determine the underlying cause and best course of action for management of the condition effectively and safely with minimal risk of recurrence or complications post-treatment for the patient's long-term benefit and satisfaction with the care received from their eye care provider team working collaboratively to achieve the best possible visual and functional outcomes for individuals affected by these common eyelid problems that can significantly impair vision and quality of life if not managed appropriately by skilled ophthalmologists specializing in oculoplastic and reconstructive surgery of the eyelids and surrounding facial structures involved in maintaining normal eye function and appearance for the patient's overall health and well-being in society as a whole. In involutional entropion, overriding of the preseptal orbicularis oculi over the tarsal plate is a crucial pathogenic factor, especially during lid closure, pushing the margin inwards.

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Types & Clinical Features - Spotting the Turn

Entropion (Inward Lid Turn)

• Types:
  • Involutional: Most common; age-related laxity, retractor disinsertion.
  • Cicatricial: Conjunctival scarring (e.g., trachoma) pulls margin.
  • Spastic: Orbicularis spasm (ocular irritation, post-op).
  • Congenital: Rare; tarsal/retractor anomaly.
• Features: Lashes rub globe (trichiasis), foreign body sensation, epiphora, corneal erosions/ulcers, conjunctival injection.

Ectropion (Outward Lid Turn)

• Types:
  • Involutional: Most common; age-related laxity, canthal tendon weakness.
  • Cicatricial: Skin scarring/contracture (e.g., burns).
  • Paralytic: CN VII palsy, orbicularis weakness, lagophthalmos.
  • Mechanical: Lid everted by mass/tumor.
  • Congenital: Rare (e.g., Down syndrome).
• Features: Punctal eversion → chronic epiphora; exposure keratopathy, corneal dryness/ulcer, conjunctival keratinization, redness.

⭐ In cicatricial ectropion, the skin is visibly tight and may restrict full eyelid closure, differentiating it from laxity-induced types.

Management Principles - Fixing the Folds

• Initial Management (Temporary/Supportive):
  • Ocular lubrication: Artificial tears, ointments to protect cornea from exposure/trichiasis.
  • Eyelid taping: To temporarily evert an entropic lid or invert an ectropic lid.
  • Botulinum toxin A: Effective for spastic entropion by relaxing orbicularis oculi.
• Surgical Correction (Definitive): Addresses underlying anatomical defects.
  • Entropion Repair:
    • Involutional:
      • Correct horizontal laxity: Lateral Tarsal Strip (LTS) is key.
      • Repair retractor disinsertion: e.g., Jones procedure (reattaches lower lid retractors).
      • Everting sutures: e.g., Quickert sutures (full-thickness).
    • Cicatricial: Release scar tissue, followed by mucous membrane graft (e.g., buccal mucosa).
  • Ectropion Repair:
    • Involutional:
      • Correct horizontal laxity: LTS, medial canthal tendon plication.
      • Shorten lid: Wedge resection (e.g., Bick procedure).
    • Cicatricial: Release contracture, then full-thickness skin graft or Z-plasty/V-Y plasty.
    • Paralytic (7th nerve palsy): Tarsorrhaphy (temporary/permanent), gold weight implant in upper lid.

⭐ The Lateral Tarsal Strip (LTS) procedure is a versatile and highly effective surgical technique for correcting horizontal lid laxity, a primary contributor to both involutional entropion and ectropion.

High‑Yield Points - ⚡ Biggest Takeaways

• Entropion: Inward turning of eyelid margin; Ectropion: Outward turning. Primarily affects lower lid.
• Involutional (age-related) is most common for both, due to horizontal lid laxity.
• Cicatricial types result from scarring (e.g., trachoma, burns). Paralytic ectropion indicates CN VII palsy.
• Entropion risks corneal abrasion/ulcer; Ectropion causes exposure keratitis, epiphora.
• Definitive management is surgical (e.g., Lateral Tarsal Strip for involutional).
• Snap-back test and lid distraction test assess lower lid laxity.