Quick answer. Ptosis is a drooping of the upper eyelid that can be present from birth or develop with age, nerve or muscle problems. A SUDDEN droopy eyelid with double vision, a severe headache or a large pupil can signal a stroke or aneurysm – call 995 immediately.
Ptosis means a drooping of the upper eyelid, where the lid sits lower than normal over the eye. The droop can be barely noticeable or severe enough to cover the pupil and block part of your vision. Some people are born with ptosis (congenital), while many develop it gradually with age as the muscle that lifts the lid stretches and weakens. It can affect one or both eyes.
In most cases ptosis develops slowly and is not dangerous, and in Singapore it is commonly treated with a straightforward eyelid-lifting operation by an eye specialist. However, a droopy eyelid that comes on suddenly – especially alongside double vision, headache or a change in pupil size – can be a warning sign of a serious nerve, aneurysm or stroke problem and needs emergency care. This guide explains the common, treatable causes and the rare red-flag signs you must never ignore.
At a glance
| Type | Typical cause | Usual approach |
|---|---|---|
| Age-related (aponeurotic) | Stretched lid-lifting muscle tendon with age | Eyelid-lifting surgery if vision or appearance affected |
| Congenital | Underdeveloped lid muscle from birth | Monitor vision; surgery, sometimes early in children |
| Muscle-related | Conditions such as myasthenia gravis | Treat the underlying condition |
| Nerve-related | Third nerve palsy, Horner's syndrome | Urgent assessment to find the cause |
| Sudden with red flags | Possible aneurysm, stroke or serious nerve problem | Call 995 / emergency department now |
What is ptosis (a droopy eyelid)?
Ptosis is the medical term for a drooping upper eyelid. The eyelid is lifted by a small muscle (the levator) and its tendon; when this muscle or its nerve supply is weakened, the lid sits lower than it should. Doctors describe ptosis by how much the lid covers the eye and whether one or both sides are affected.
Most ptosis is gradual and harmless, caused by the natural loosening of the lid muscle’s tendon with age or present from birth. It becomes a concern when it blocks vision, affects a child’s developing sight, or – importantly – when it appears suddenly with other symptoms that point to a nerve or brain problem. In Singapore, age-related ptosis is the type eye specialists see most often.
Symptoms & signs
The main sign is an upper eyelid that sits lower than normal. Depending on the cause you may also notice:
- One or both upper lids drooping, sometimes covering part of the pupil
- A reduced or blocked field of vision, especially looking up
- Tilting the head back or raising the eyebrows to see better
- Tired, aching eyes or forehead from constantly lifting the brow
- In children, a head tilt or turn, or signs of a lazy eye
- In muscle conditions, droop that worsens through the day or with tiredness
Note which eye is affected, how quickly it came on, and whether anything else has changed, such as double vision – this information helps the doctor a great deal.
Causes & risk factors
Ptosis has several possible causes, ranging from harmless to serious:
- Ageing – the most common cause; the lid-lifting tendon stretches over time
- Congenital – present from birth due to an underdeveloped lid muscle
- Contact lens wear or previous eye surgery – can stretch the lid tendon
- Muscle disorders – such as myasthenia gravis, where weakness fluctuates and often worsens later in the day
- Nerve problems – a third cranial nerve palsy or Horner’s syndrome, which can be linked to aneurysms or other serious conditions
- Trauma or eyelid lumps – that physically weigh the lid down
While most cases are simple age-related changes, a sudden droop or one with neurological symptoms always needs to be investigated.
How it's diagnosed
An eye specialist assesses ptosis with a focused history and examination. This usually includes:
- Eyelid measurements – how far the lid covers the eye and how well the lid muscle works
- Visual field check – to see whether the droop is blocking vision
- Pupil and eye-movement examination – a large pupil, an abnormal pupil, or restricted eye movement can point to a nerve cause
- Tests for muscle disease – if myasthenia gravis is suspected, including blood tests and assessing whether the droop worsens with fatigue
- Brain or vessel imaging (CT/MRI) – urgently if a nerve, aneurysm or stroke cause is suspected
The depth of testing depends on the picture: simple age-related ptosis needs little, while sudden or nerve-related ptosis is investigated promptly.
Treatment options
Treatment depends entirely on the cause:
- Age-related and congenital ptosis – corrected with eyelid-lifting surgery (ptosis repair), which tightens or reattaches the lid-lifting muscle. It can improve both vision and appearance
- Children with congenital ptosis – watched closely, as a lid covering the pupil can cause a lazy eye; surgery may be done early if vision is at risk
- Muscle conditions such as myasthenia gravis – treated with medication for the underlying disease rather than surgery first
- Nerve-related ptosis – the priority is finding and treating the underlying cause, which may be urgent
Because the right treatment hinges on the diagnosis, the first step is always an accurate assessment. This guide does not quote surgical prices, as they vary by procedure and provider.
When to see a doctor & which specialist
Call 995 or go to the nearest emergency department immediately if a droopy eyelid comes on SUDDENLY together with any of these:
- Double vision
- A severe or sudden headache
- A large or unequal pupil
- Drooping of the face, slurred speech, weakness or numbness
- Eye pain or sudden loss of vision
This combination can signal a brain aneurysm, a nerve palsy or a stroke, where every minute matters. Do not wait to see if it settles.
For a droopy eyelid that has developed gradually over months or years and is not accompanied by the red flags above, book a non-urgent appointment with an eye specialist – especially if it is blocking your vision or affecting a child’s sight. If the droop fluctuates and worsens with tiredness, mention this, as it may point to a muscle condition needing a neurologist’s input.
The specialist who assesses and treats ptosis is an ophthalmologist (eye specialist). You can find one through our directory of eye specialists in Singapore.
Related guides
- Best Eye Clinics in Singapore — our editorial shortlist
- eye clinics directory
- Keratoconus
- Mitral valve prolapse
- Sarcoidosis
- Pulmonary fibrosis
- Essential tremor
Sources
- NHS – Drooping eyelids (ptosis)
- Mayo Clinic – Ptosis and eyelid problems
- SingHealth – Eye conditions and treatments
- HealthHub Singapore – Eye health
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