Ophthalmology – Lagophthalmos & Lid Retraction Basics Description Lagophthalmos means incomplete eyelid closure. Lid retraction refers to abnormal elevation of the upper eyelid or depression of the lower eyelid so that sclera is visible above the superior limbus or below the inferior limbus when the patient is looking straight ahead with the brows relaxed and the head in a normal position. Both conditions can lead to exposure of the ocular surface, resulting in irritation, tearing, superficial punctate keratopathy, corneal ulceration, scarring, and, in severe cases, visual loss.

Epidemiology The incidence depends on the underlying cause. Lid retraction is the most common eyelid sign of thyroid eye disease. Lagophthalmos is also commonly encountered in: Facial nerve palsy Postoperative eyelid abnormalities Cicatricial eyelid disease Proptosis Severe ectropion

Risk Factors Risk factors depend on the cause and include: Thyroid eye disease Facial nerve palsy Previous eyelid or orbital surgery Prior trauma Chemical burns Cicatrizing conjunctival disorders Proptosis Aging-related eyelid laxity Previous aggressive blepharoplasty

General Prevention Some postoperative cases can be prevented with careful surgical technique. Important preventive measures include: Avoiding excessive skin removal during blepharoplasty Proper reconstruction of the lateral canthal tendon after canthotomy or cantholysis Appropriate use of postoperative traction sutures when indicated Avoiding excessive scarring or shortening of the eyelid lamellae Careful management of extraocular muscle surgery in thyroid eye disease Early treatment of ocular surface exposure also helps prevent corneal complications.

Pathophysiology of Lagophthalmos Normal eyelid closure depends on proper eyelid anatomy, globe position, and functioning of the orbicularis oculi muscle, which is supplied by cranial nerve VII. Lagophthalmos may occur when the eyelids are unable to cover the globe because of several mechanisms.

Proptosis If the globe protrudes excessively, normal eyelids may no longer be able to close fully over the cornea. Causes include: Thyroid eye disease Orbital tumor Retrobulbar hemorrhage Orbital inflammation Naturally shallow orbits

Anterior Lamellar Shortening The anterior eyelid lamella consists primarily of skin and orbicularis muscle. Scarring or tissue loss can shorten this layer and prevent eyelid closure. Causes include: Previous eyelid surgery Excessive blepharoplasty Trauma Herpes zoster scarring Tumor excision Burns

Posterior Lamellar Scarring The posterior lamella includes the tarsus and conjunctiva. Cicatrization can shorten the inner eyelid and restrict movement. Causes include: Ocular cicatricial pemphigoid Chemical injury Trachoma Severe conjunctival inflammation

Neurogenic Lagophthalmos The orbicularis oculi closes the eyelid and is innervated by cranial nerve VII. Facial nerve palsy can therefore cause: Poor blink Incomplete closure Lower lid laxity Ectropion Exposure keratopathy

Pathophysiology of Lid Retraction Lid retraction is present even when the eye is at rest in primary gaze. It may result from: Overactivity or fibrosis of eyelid retractors Proptosis Scarring Mechanical traction Thyroid eye disease Previous eyelid or orbital surgery Upper eyelid retraction is especially characteristic of thyroid eye disease. Lower eyelid retraction may coexist with significant ectropion.

Etiology Major causes include: Autoimmune Thyroid eye disease Ocular cicatricial pemphigoid Inflammatory or Cicatricial Postoperative scarring Trachoma Leprosy Chemical burns Neurogenic Facial nerve palsy Mechanical Proptosis Shallow orbit Eyelid tumor Scar contracture Involutional Age-related lower eyelid laxity Ectropion

Commonly Associated Conditions Important associated disorders include: Thyroid eye disease Facial nerve palsy Ectropion Previous eyelid surgery Orbital tumors Cicatrizing conjunctival disease

Diagnosis History Important questions include: When did the eyelid abnormality begin? Is it worsening? Is there tearing? Foreign-body sensation? Burning or gritty sensation? Photophobia? Eye pain? Reduced vision? Diplopia? Pain with eye movement? Previous eyelid or facial surgery? Previous trauma? History of facial herpes zoster? Chronic topical eye medication use? Chemical injury? Thyroid disease? Facial weakness? History often helps identify whether the problem is mechanical, neurologic, inflammatory, or postoperative.

Physical Examination A complete eyelid, orbital, and ocular examination is required.

Eyelid Position For lid retraction, assess the eyelids in primary gaze with: Head straight Brows relaxed No voluntary eyelid elevation Scleral show above or below the limbus supports lid retraction.

Eyelid Closure To assess lagophthalmos, the patient should be asked to gently close the eyes normally, rather than squeeze forcefully. Any residual gap between the upper and lower eyelids should be measured. Forced closure may appear normal even when spontaneous or gentle closure is inadequate.

Blink Function Observe: Frequency of spontaneous blinking Completeness of blink Orbicularis strength Bell phenomenon Reduced blink function substantially increases the risk of exposure keratopathy.

Tarsal Conjunctiva Evert the eyelids and look for: Conjunctival scarring Foreshortening Symblepharon Signs of ocular cicatricial pemphigoid

Facial Nerve Examination Look for: Facial asymmetry Poor forehead movement Weak eyelid closure Drooping mouth Reduced orbicularis strength These findings suggest cranial nerve VII dysfunction.

Proptosis Assessment Hertel exophthalmometry can quantify proptosis. Proptosis suggests an orbital cause such as: Thyroid eye disease Tumor Inflammation Hemorrhage

Ocular Motility Assess: Extraocular movements Alignment Diplopia Restriction may suggest thyroid eye disease or an orbital mass.

Pupillary Examination Check for: Relative afferent pupillary defect Abnormal pupillary responses An RAPD may indicate optic nerve involvement from severe thyroid orbitopathy or an orbital mass.

Corneal Examination This is one of the most important parts of the examination. Look for: Superficial punctate epithelial erosions Inferior exposure staining Corneal epithelial defects Ulceration Stromal thinning Scarring Infection Fluorescein staining helps define the extent of exposure damage.

Anterior Segment Examination Also assess for: Iris atrophy Uveitis Corneal edema Secondary inflammation

Fundus Examination Fundoscopy is important when orbital disease is suspected. Possible findings include: Choroidal folds Optic disc edema Optic atrophy These findings may indicate orbital compression or mass effect.

Diagnostic Tests and Interpretation Thyroid Testing If thyroid eye disease is suspected, testing may include: TSH Free T4 T3 Thyroid-stimulating immunoglobulins or related thyroid antibodies

Conjunctival Biopsy If ocular cicatricial pemphigoid is suspected, conjunctival biopsy may be performed for direct immunofluorescence. Typical findings may include deposition of immunoglobulins and complement along the basement membrane zone.

Orbital Imaging CT or MRI of the orbits may be indicated when evaluating for: Thyroid eye disease Orbital mass Proptosis Extraocular muscle enlargement Orbital inflammation In thyroid eye disease, enlargement of extraocular muscle bellies with relative tendon sparing may be seen.

Brain and Facial Nerve Imaging MRI or other neurologic imaging may be required when investigating unexplained facial nerve palsy. The exact imaging depends on the suspected location and cause of the lesion.

Visual Field Testing Visual fields may be useful when optic neuropathy is suspected. Defects can occur in: Severe thyroid eye disease Orbital tumors Compressive lesions

Color Vision Reduced color discrimination may be an early sign of compressive optic neuropathy.

External Photography Clinical photographs are useful for: Documenting eyelid position Monitoring progression Comparing with old photographs Distinguishing acquired disease from a longstanding normal variant

Differential Diagnosis The differential depends on the suspected mechanism. Important possibilities include: Thyroid eye disease Orbital tumor Shallow orbits Facial nerve palsy Cicatricial eyelid disease Postoperative scarring Ectropion Ocular cicatricial pemphigoid Chemical injury Apparent lower lid retraction can occasionally result from chronic abnormal head posture rather than true eyelid disease.

Treatment Treatment has two major goals: Protect the cornea Correct the underlying eyelid or orbital abnormality

Observation If the patient is asymptomatic and the cornea remains healthy, observation may be appropriate. Periodic examination is still required because exposure can worsen.

Lubrication First-line therapy for exposure usually includes: Frequent preservative-free artificial tears Lubricating gels Ointment at bedtime More severe exposure requires more frequent lubrication.

Nighttime Protection Patients with nocturnal lagophthalmos may benefit from: Taping the eyelids closed Moisture chamber goggles Protective eye shields The lids should be closed carefully without exerting pressure on the globe.

Environmental Measures Patients should avoid excessive ocular surface drying. Helpful measures include: Directing fans away from the face Avoiding strong air-conditioning drafts Using a room humidifier Avoiding unnecessary prolonged exposure to dry environments

Treatment of Associated Conditions Other ocular surface problems should also be treated, including: Blepharitis Allergic conjunctivitis Dry eye Meibomian gland dysfunction Underlying systemic conditions such as thyroid eye disease or ocular cicatricial pemphigoid require specific treatment.

Surgical Treatment Surgery is considered when conservative therapy does not adequately protect the cornea or when eyelid malposition is significant. The procedure depends on the mechanism.

Tarsorrhaphy A temporary or permanent tarsorrhaphy partially joins the upper and lower eyelids. It can be very effective for severe exposure. It may be used in: Facial nerve palsy Neurotrophic cornea Severe lagophthalmos Persistent epithelial defects

Upper Eyelid Retraction Surgery Upper eyelid retractors may be recessed. Structures that may be weakened include: Müller muscle Levator palpebrae superioris The procedure may be performed through a skin or conjunctival approach.

Upper Eyelid Weight Implant For facial nerve palsy, a gold or platinum weight can be implanted into the upper eyelid. Gravity helps bring the lid downward when the patient attempts to close the eye. Platinum weights are often thinner for a given weight than gold implants.

Eyelid Springs Mechanical eyelid springs may occasionally be used in selected facial paralysis cases.

Lower Eyelid Retraction Surgery Options include: Lower lid retractor recession Lateral canthal tightening Spacer graft placement Midface elevation in selected cases Spacer materials may include: Buccal mucosa Acellular dermal matrix Other graft tissues

Skin Grafting Anterior lamellar deficiency may require a full-thickness skin graft. This is particularly relevant after: Excessive blepharoplasty Trauma Tumor removal Cicatricial shortening

Ectropion Repair Paralytic or involutional lower lid ectropion may require: Horizontal shortening Lateral tarsal strip Canthoplasty Improving lower eyelid position helps restore the tear reservoir and protect the cornea.

Management of Facial Nerve Palsy The urgency of surgical intervention depends partly on whether facial nerve recovery is expected. If recovery is likely, temporary measures may be preferred. If permanent weakness is expected, definitive correction of: Lagophthalmos Upper lid retraction Lower lid ectropion may be necessary.

Follow-Up Follow-up depends primarily on the severity of corneal exposure. Severe disease may require: Daily review Very frequent outpatient monitoring Occasionally inpatient management Mild stable disease may only require periodic or annual review.

Referral Depending on the cause, appropriate specialists may include: Oculoplastic surgeon Corneal specialist Endocrinologist Primary care physician Neurologist ENT specialist Neurosurgeon

Patient Education Patients should understand that the main risk is corneal exposure. They should seek urgent review for: Increasing pain Sudden decrease in vision Increased redness Severe photophobia Corneal opacity Increasing discharge Regular lubrication and nighttime protection should be emphasized when recommended.

Prognosis The prognosis depends on: Underlying cause Severity of eyelid dysfunction Degree of corneal exposure Corneal sensation Response to treatment Mild cases may remain stable with lubrication alone. Severe untreated exposure can progress to: Persistent epithelial defect Infectious keratitis Corneal ulceration Thinning Perforation Permanent visual loss

Complications Important complications include: Exposure keratopathy Corneal abrasion Corneal ulceration Infectious keratitis Corneal scarring Corneal perforation Visual loss Chronic tearing Cosmetic disfigurement The key clinical pearl is: lagophthalmos is diagnosed by incomplete gentle eyelid closure, while lid retraction is diagnosed by scleral show in primary gaze; in both conditions, the immediate priority is protection of the corneal surface.