Entropion: Inward-Turning Eyelid
What Is Entropion
Entropion is a condition in which the eyelid, most often the lower lid, turns inward so that the eyelashes and skin rub directly against the surface of the eye. Your eyelids serve as protective barriers that spread tears evenly across the eye surface each time you blink. A complex system of muscles, tendons, and connective tissue holds the eyelid in its correct outward-facing position. When any part of this support system weakens or is disrupted, the lid margin can roll inward, leading to entropion.
Entropion is classified based on the underlying cause. Involutional entropion is the most common form and develops gradually as age-related changes loosen the eyelid tissues and weaken the muscles that hold the lid in place. Cicatricial entropion results from scarring on the inner surface of the eyelid, often caused by chronic inflammatory conditions, prior surgery, or chemical injury. Congenital entropion is present at birth due to structural abnormalities, and spastic entropion develops when the eyelid muscles go into spasm.
Entropion is most frequently seen in adults over the age of 60 as the supportive tissues of the eyelid naturally lose elasticity with age. People who have had previous eye surgeries, chronic eye infections such as trachoma, or inflammatory skin conditions affecting the eyelids are also at higher risk. According to the AAO, entropion and related eyelid malposition conditions are common causes of ocular surface irritation and corneal damage in older adults.
What Causes the Eyelid to Turn Inward
The most common cause of entropion is the gradual weakening of the muscles and connective tissue that support the lower eyelid. Over time, the horizontal laxity of the lid increases and the lower eyelid retractor muscles lose their ability to keep the lid margin turned outward during blinking. This involutional process typically affects both eyes.
When the tissue lining the inside of the eyelid becomes scarred, it can physically pull the lid margin inward. Conditions that may cause this type of scarring include trachoma, ocular cicatricial pemphigoid, Stevens-Johnson syndrome, and chemical burns. Prior eyelid or eye surgery can also lead to scar formation that contributes to cicatricial entropion.
Irritation from a foreign body, infection, or dry eye can trigger the orbicularis muscle to contract forcefully, temporarily rolling the eyelid inward. Spastic entropion may resolve once the underlying irritation is treated. Patients who experience chronic tearing from tear duct infections or other conditions may also develop secondary eyelid irritation.
Symptoms of Entropion
One of the earliest and most common complaints is the persistent feeling that something is stuck in the eye. This foreign body sensation is caused by the eyelashes scraping across the cornea and conjunctiva with each blink. The irritation tends to worsen throughout the day as repeated blinking increases the friction against the eye surface.
The constant rubbing of lashes against the eye surface triggers a reflex tearing response, leading to watery eyes that may interfere with daily activities. In some cases, the irritation also produces a mucous discharge, especially if a secondary infection develops.
The affected eye typically appears red and inflamed due to ongoing mechanical irritation. Many patients also develop increased sensitivity to light and wind. These symptoms can make it difficult to spend time outdoors or work in bright settings.
How Entropion Is Diagnosed
During your visit, our cornea specialists will carefully observe the position of your eyelids at rest and during blinking. A snapback test may be performed by gently pulling the lower lid away from the eye and releasing it to evaluate how quickly and accurately it returns to its normal position.
A slit-lamp microscope provides a magnified, detailed view of the eyelid margins, lashes, and the surface of the eye. This examination allows us to identify areas where lashes are making contact with the cornea and to detect early signs of corneal damage, such as punctate erosions or abrasions.
Determining whether entropion is involutional, cicatricial, spastic, or congenital is essential for planning the most effective treatment. We may evert the eyelid to examine the inner surface for scarring, assess the tone of the eyelid retractor muscles, and review your medical history.
Frequently Asked Questions
Yes, untreated entropion can cause significant corneal damage. The constant rubbing of eyelashes against the cornea creates tiny scratches that can progress to corneal ulcers if bacteria enter the damaged tissue. Over time, repeated injury may lead to corneal scarring, thinning, or even perforation in severe cases.
Several non-surgical options can provide temporary relief. Lubricating eye drops and ointments help protect the corneal surface by reducing friction. Transparent medical tape can be applied to the lower eyelid to hold it in a normal outward position. In some cases, botulinum toxin injections into the orbicularis muscle can relax the eyelid spasm.
The surgical technique depends on the type and severity of entropion. For involutional entropion, surgeons commonly perform a procedure that tightens the horizontal eyelid and reattaches the lower eyelid retractor muscles. Cicatricial entropion often requires grafting of tissue to replace the scarred inner lining.
Most patients experience mild swelling and bruising around the eyelid for the first one to two weeks following surgery. Sutures are typically removed within seven to fourteen days, and many patients return to their normal routine within two to three weeks.
Entropion can recur, particularly if the underlying cause continues to progress. Involutional entropion may return over time as the aging process continues to affect eyelid support structures, though recurrence rates after properly performed surgery are generally low.
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