The medical term used to describe a condition in which a person cannot fully close one or both eyes is lagophthalmos. This condition can occur for several reasons. While it may develop as a result of trauma or surgery, in many cases it is associated with facial nerve dysfunction or paralysis. Common contributing factors include eyelid surgeries such as blepharoplasty or ptosis repair, underlying eyelid conditions (such as ptosis), and neurological disorders that affect facial movement.
Mild forms of lagophthalmos often do not cause significant health problems. However, in more severe cases, the cornea remains partially or completely exposed. This continuous exposure to air, dust, wind, and other environmental irritants can lead to dryness, irritation, and potential damage to the eye’s surface.
Types of Lagophthalmos
Healthcare professionals classify lagophthalmos into several types based on its cause and presentation. Examples include:
- Nocturnal lagophthalmos – The term “lagophthalmos” originates from Greek and loosely translates to “hare-like eye,” based on the historical belief that hares sleep with their eyes open. Although modern research suggests that most hares sleep with their eyes closed, a minority may keep them partially open. In people with nocturnal lagophthalmos, the eyes close normally while awake but remain partially open during sleep, which can lead to nighttime dryness and irritation.
- Paralytic lagophthalmos – This type occurs when a person loses the ability to fully close the eyelids due to dysfunction or paralysis of the facial nerve (cranial nerve VII). Humans have two facial nerves, one on each side of the face, that control facial expressions, including eyelid closure.
- Mechanical lagophthalmos – This form results from structural abnormalities, trauma, or physical restrictions that prevent proper eyelid closure. A subtype called cicatricial lagophthalmos occurs when scarring of the eyelid tissues restricts movement and prevents full closure.
What Are the Symptoms of Lagophthalmos?
The primary symptom of lagophthalmos is the inability to completely close one or both eyes. However, a variety of additional symptoms may develop due to prolonged exposure of the eye surface. These include:
- Redness of the eyes
- Blurred or fluctuating vision
- Increased sensitivity to light (photophobia)
- Corneal ulcers (open sores on the cornea)
- Watery eyes or excessive tearing (a reflex response to dryness)
- Dry eyes and irritation
- A persistent sensation of a foreign body in the eye
- Burning, stinging, or eye pain
If any of these symptoms occur, it is important to seek medical help. Without appropriate treatment, lagophthalmos may lead to serious and potentially permanent complications.
Causes
Lagophthalmos is not a contagious condition and cannot spread from person to person. It typically develops due to damage affecting either the facial nerve or the eyelids themselves.
Nerve Damage
Damage to the facial nerve is one of the most common causes. Check below for other causes of facial nerve damage:
- Moebius syndrome (a rare congenital neurological condition)
- Autoimmune disorders (such as Guillain-Barré syndrome)
- Stroke
- Bell’s palsy (temporary facial paralysis)
- Eye or facial injuries (cuts, trauma, or accidents)
- Tumors (such as acoustic neuromas)
- Infections affecting the nerves
- Exposure to certain toxins
Eyelid Damage
Lagophthalmos can also occur when the eyelids are structurally damaged, weakened, or scarred. Examples include:
- Chemical burns
- Chronic sun damage
- Eyelid surgeries (such as blepharoplasty or ptosis repair)
- Severe skin conditions (such as Stevens-Johnson syndrome)
- Lax eyelid syndrome (LES), including floppy eyelid syndrome (FES)
Lax eyelid syndrome refers to unusually loose and easily everted eyelids. These eyelids may flip outward spontaneously and are more commonly seen in individuals who are overweight or obese, particularly middle-aged men.
What Are the Long-Term Effects of Lagophthalmos?
If left untreated, lagophthalmos can lead to a range of complications, some of which may be severe. These include:
- Exposure keratopathy – Chronic dryness can damage the cornea and conjunctiva, causing discomfort and reduced vision.
- Corneal ulceration and infection – The exposed cornea becomes more vulnerable to scratches and infections, which may require urgent treatment.
- Chronic dry eye (keratitis sicca) – Persistent tear film evaporation damages the eye surface over time.
- Permanent vision loss (blindness) – In severe and untreated cases, vision loss may occur.
- Secondary infections – These include bacterial or viral infections such as herpes simplex keratitis.
- Symblepharon – A serious condition where the eyelid’s conjunctiva adheres to the eyeball.
- Severe or persistent eye pain
- Vision disturbances (including blurred or double vision)
- Ongoing foreign body sensation
- Redness and inflammation
This is not a complete list of complications. A healthcare provider can recommend strategies to reduce the risk and protect eye health.
How to Prevent Lagophthalmos?
In most cases, lagophthalmos cannot be fully prevented, especially when it is caused by neurological conditions or unavoidable trauma. However, certain measures may help reduce the risk or minimize complications:
- Wear protective eyewear during sports or hazardous work
- Maintain good hand hygiene to reduce infection risk
- Avoid rubbing or touching the eyes unnecessarily
- Protect your eyes from excessive sun exposure by wearing sunglasses
- Seek prompt treatment for eye injuries or infections
Diagnosis
To diagnose lagophthalmos, a healthcare provider will begin with a physical examination of the eyes and eyelids. They may also ask questions about symptoms, medical history, and any recent injuries or surgeries. However, to confirm or rule out this condition, doctors often perform some tests. Examples include:
- Slit-lamp examination – A specialized microscope is used to closely examine the cornea and detect dryness, irritation, or ulcers.
- Fluorescein staining – A dye is applied to highlight areas of corneal damage.
- Eyelid function tests – These assess eyelid strength, movement, and elasticity.
- Light test – During this test, a light is directed at closed eyelids to determine whether any light passes through them.
Treatment
Treatment for lagophthalmos depends on the underlying cause, severity, and overall health of the patient. Mild cases are often managed with nonsurgical approaches, while more severe cases may require surgical intervention.
Nonsurgical Treatments
- Artificial tears (lubricating eye drops)
- Lubricating ointments, especially at night
- Moisture-retaining goggles or specialized glasses
- Eyelid taping during sleep
- External eyelid weights applied temporarily
Surgical Treatments
- Tarsorrhaphy – A procedure in which part of the eyelids is partially sewn together to reduce exposure and improve eye closure.
- Gold or platinum eyelid implants – Small weights are inserted into the upper eyelid to help it close naturally, especially in cases of facial paralysis.
- Eyelid reconstruction surgery – Procedures to repair structural abnormalities, including skin grafts or muscle adjustments.
- Facial reanimation surgery – In cases of facial paralysis, procedures may help restore facial movement and improve eyelid function.
Frequently Asked Questions
What are the possible complications of lagophthalmos treatment?
Some individuals may experience complications following treatment, particularly after surgery. These may include infection, scarring, eyelid malposition (such as entropion), drooping eyelids (ptosis), implant-related issues, or problems at graft sites. Discuss potential risks and benefits with your healthcare provider before undergoing treatment.
When should I see my healthcare provider?
You should seek medical attention if you experience symptoms such as persistent dryness, excessive tearing, inability to fully close your eyes, eye pain, redness, or a sensation that something is stuck in your eye. Early diagnosis and treatment can help prevent complications and preserve vision.
What is the difference between ptosis and lagophthalmos?
Although both conditions affect the eyelids, they are different. Lagophthalmos refers to the inability to fully close the eyes, while ptosis is characterized by drooping of the upper eyelid. In some cases, both conditions may coexist, but they have distinct causes and treatment approaches.
Can lagophthalmos go away on its own?
In some cases, particularly when caused by temporary conditions such as Bell’s palsy, lagophthalmos may improve or resolve as nerve function recovers. However, persistent or severe cases usually require treatment to prevent eye damage.
Is lagophthalmos a medical emergency?
Lagophthalmos itself is not always an emergency, but it can become one if it leads to corneal damage, severe dryness, or infection. Sudden onset, especially after trauma or neurological symptoms, should be evaluated immediately.
Can lagophthalmos affect both eyes?
Yes, lagophthalmos can affect one or both eyes, depending on the underlying cause. Bilateral cases are less common but may occur in systemic or neurological conditions. If you have any other questions, ask your healthcare provider.
