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Lagophthalmos: Causes, Symptoms and Treatment
Lagophthalmos is the inability to fully close the eyelid. This can expose the cornea to dryness and damage, requiring prompt medical attention.
Add as Preferred SourceThings worth knowing about "Lagophthalmos"
Lagophthalmos is the inability to fully close the eyelid. This can expose the cornea to dryness and damage, requiring prompt medical attention.
What is Lagophthalmos?
Lagophthalmos is a medical condition in which the eyelid cannot be fully closed. The term derives from the Greek words lagos (hare) and ophthalmos (eye), referring to the belief that hares sleep with their eyes partially open. When the eyelid fails to close completely, the cornea and conjunctiva are left exposed, leading to dryness, irritation, and potentially serious eye damage.
Causes
Lagophthalmos can result from a variety of underlying conditions:
- Facial nerve palsy (facial paralysis): The most common cause. The facial nerve (cranial nerve VII) controls the orbicularis oculi muscle responsible for eyelid closure. Paralysis of this nerve prevents complete lid closure.
- Bell palsy: A sudden, idiopathic (of unknown cause) unilateral facial nerve paralysis that frequently causes lagophthalmos.
- Scarring: Burns, trauma, or surgical procedures involving the eyelids can result in scarring that mechanically restricts lid closure.
- Exophthalmos (proptosis): Abnormal protrusion of the eyeball, often associated with thyroid eye disease, can prevent full eyelid closure.
- Tumors or surgical resection in the facial or periorbital area.
- Congenital eyelid abnormalities.
Symptoms
Symptoms of lagophthalmos are primarily caused by inadequate lubrication and protection of the ocular surface:
- Dryness, burning, and a foreign body sensation in the eye
- Redness of the conjunctiva (conjunctivitis)
- Sensitivity to light (photophobia)
- Blurred vision
- Corneal damage such as erosions or ulcers (exposure keratitis or corneal ulcer)
- In severe cases: permanent vision loss due to corneal scarring
Diagnosis
Diagnosis is typically made through a comprehensive ophthalmological examination. The physician assesses the degree of eyelid closure and the condition of the cornea. Additional diagnostic tools may include:
- Slit-lamp examination: For detailed assessment of the cornea and conjunctiva.
- Fluorescein staining: To detect corneal surface defects and epithelial erosions.
- Neurological evaluation: If facial nerve palsy is suspected.
- Imaging (e.g., MRI): To identify structural or neurological causes.
Treatment
Treatment depends on the underlying cause and severity of the condition. The primary goal is to protect the cornea from drying out and from injury.
Conservative Management
- Artificial tears: Frequent use of lubricating eye drops or gels to maintain moisture.
- Eye ointments: Particularly important at night to protect the corneal surface during sleep.
- Moisture chambers or goggle-type dressings: Devices that create a humid microenvironment around the eye.
- Eye patching or taping: Taping the eyelid shut during sleep to prevent exposure.
Surgical and Interventional Options
- Gold or platinum weight implantation: A small weight is surgically placed in the upper eyelid to enable gravity-assisted closure.
- Tarsorrhaphy: Partial surgical suturing of the eyelid margins to reduce the palpebral fissure and protect the cornea.
- Treatment of the underlying cause: For example, managing thyroid disease or surgically correcting eyelid scarring.
Prognosis
The outlook for patients with lagophthalmos depends largely on the underlying cause. In cases such as Bell palsy, many patients recover full eyelid function over time. For those with permanent nerve damage or structural causes, long-term protective measures or surgical intervention are necessary to preserve vision.
References
- Bhatt, N.K., Bhatt, A.A., Soni, A.: Lagophthalmos. StatPearls Publishing, 2023. Available at: https://www.ncbi.nlm.nih.gov/books/NBK560840/
- Peitersen, E.: Bell's palsy: the spontaneous course of 2,500 peripheral facial nerve palsies of different etiologies. Acta Otolaryngol Suppl. 2002;549:4–30. PubMed PMID: 12482166.
- Kanski, J.J., Bowling, B.: Clinical Ophthalmology: A Systematic Approach. 8th edition. Elsevier, 2015.
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