Ptosis (Drooping Eyelid)

Overview

Ptosis is the medical term for a drooping upper eyelid. The eyelid may droop only slightly or may sag enough to cover part or all of the pupil and interfere with vision. It can affect one eye or both, and it may be present from birth (congenital ptosis) or develop later in life (acquired ptosis), most commonly with aging.

Many cases of ptosis are due to gradual weakening or stretching of the muscle and tissues that lift the eyelid, and are not a sign of serious illness. However, ptosis can occasionally be a clue to a problem with nerves or muscles, and a sudden droop, especially with other symptoms, can signal a medical emergency. Assessment helps determine the cause and whether treatment is needed.

The upper eyelid is lifted mainly by a muscle called the levator, with help from a smaller muscle, and is controlled by nerves running from the brain. Drooping can result from a problem at any point along this system: the muscle itself stretching with age, the nerve supply being interrupted, or a disorder affecting how nerve signals reach the muscle. Because the same drooping appearance can have very different causes, ranging from harmless age-related change to an urgent neurological problem, the pattern of the droop and any accompanying symptoms are important clues that guide assessment.

Symptoms

The main feature is a lowered upper eyelid. Associated symptoms may include:

• One or both upper eyelids sitting lower than usual
• Reduced field of vision if the lid covers the pupil
• Tilting the head back or raising the eyebrows to see better
• Tired, aching eyes or eyebrow strain
• In children, a turned or lazy eye if vision is blocked

Sudden drooping accompanied by double vision, a different-sized pupil, severe headache, facial weakness, difficulty speaking or swallowing, or weakness elsewhere needs emergency assessment, as it can indicate a serious nerve or neurological problem.

Causes

Ptosis has several possible causes depending on age and how it develops:

• Aging (involutional): The most common cause in adults, from stretching or thinning of the muscle that lifts the eyelid.
• Congenital: Present from birth due to underdevelopment of the lifting muscle.
• Nerve problems: Conditions affecting the nerves that control the eyelid, such as a third nerve palsy or Horner syndrome.
• Muscle disorders: Such as myasthenia gravis, which causes fluctuating, fatigable drooping.
• Local causes: Eyelid swelling, a stye, or trauma, and rarely a tumor.

Risk Factors

• Older age
• Previous eye surgery, including cataract surgery
• Long-term contact lens or eye rubbing in some cases
• Family history of congenital ptosis
• Certain nerve or muscle conditions

Diagnosis

An eye doctor evaluates the degree of droop and looks for the underlying cause. Assessment may include:

• Measuring eyelid position and the strength of the lifting muscle
• Checking pupil size, eye movements, and vision
• Looking for signs of nerve or muscle disease
• Tests such as blood tests or imaging if a nerve, muscle, or neurological cause is suspected

A few patterns help point to the cause. Drooping that worsens through the day or with tiredness and improves with rest can suggest a muscle-signaling problem such as myasthenia gravis. A droop combined with a small pupil and reduced sweating on one side of the face may indicate Horner syndrome, while a droop with a large pupil and double vision raises concern about a third nerve problem that needs urgent evaluation. In children, the doctor also checks carefully that the droop is not blocking vision and causing a lazy eye, since early treatment can prevent lasting vision problems.

Treatment

Treatment depends on the cause, severity, and effect on vision.

• Treating the underlying cause: For example, managing a muscle or nerve condition if one is found.
• Surgery: The main treatment for persistent ptosis is an operation to tighten or reposition the eyelid-lifting muscle, improving both vision and appearance.
• Prompt treatment in children: If ptosis blocks a child's vision, early treatment is important to prevent a lazy eye (amblyopia).
• Supportive options: Special glasses with a small support (a ptosis crutch) can help selected people.

If a nerve or muscle disorder such as myasthenia gravis is found, treating that condition can improve the drooping, and surgery may be delayed until the underlying problem is controlled. When surgery is done for age-related ptosis, it is usually a relatively short procedure that adjusts the eyelid-lifting muscle, and it can improve both the field of vision and appearance. An oculoplastic or eye specialist usually guides the choice and timing of treatment, taking into account the cause, how much the lid droops, and how it affects vision and daily life.

Self-Care & Prevention

• Avoid vigorous eye rubbing, which can stretch eyelid tissues over time
• Attend follow-up after eye surgery if the eyelid droops afterward
• Have a child's eyes checked promptly if an eyelid appears to droop
• Report new or changing drooping to a doctor for evaluation

When to See a Doctor

See a doctor for a drooping eyelid that affects your vision, appearance, or is new or worsening. Seek emergency care immediately if a droopy eyelid appears suddenly together with:

• Double vision or a pupil that is a different size
• Severe headache
• Facial drooping, slurred speech, or weakness in an arm or leg
• Difficulty swallowing or breathing

These can signal a stroke, an aneurysm, or another serious condition that needs urgent treatment. In children, prompt assessment prevents long-term vision problems.

Related Topics

Frequently Asked Questions

References

1. American Academy of Ophthalmology. Ptosis (Drooping Eyelid).
2. Mayo Clinic. Ptosis.
3. National Eye Institute (NEI).
4. MedlinePlus, U.S. National Library of Medicine. Eyelid drooping.