Ptosis (blepharoptosis) is a condition in which the upper eyelid sits lower than its normal position, sometimes covering part of the pupil. It is a common reason patients come to plastic-surgery consultations — but it is also one of the most legitimate reasons to be referred for medical evaluation before considering surgery.
Ptosis: clinical definition
Normally the upper lid covers about 1–2 mm of the upper cornea. When the upper lid covers more than 2 mm — particularly when it impinges on the pupil — that is ptosis. Severity grading:
- Mild ptosis: the lid is 1–2 mm lower than normal.
- Moderate ptosis: the lid covers 3–4 mm more than normal.
- Severe ptosis: the lid covers 4 mm or more — usually impairing vision.
Differentiating the cause
Congenital ptosis
The levator muscle has been incompletely developed since birth. Children can show one side noticeably lower than the other. If severe enough to threaten visual development (amblyopia), early surgery is needed. If mild, surgery can be deferred until the child is older.
Age-related (aponeurotic) ptosis
The most common cause in adults. With age the levator aponeurosis stretches or detaches partially from its insertion on the tarsus, gradually lowering the lid. This is a slow process over years and is usually symmetric.
Myogenic ptosis
Certain muscle diseases — particularly myasthenia gravis — cause ptosis with other features: variability through the day (worse in the evening), double vision, generalised muscle weakness. This is one of the most important reasons for medical evaluation before any surgery.
Neurogenic ptosis
Damage to the oculomotor nerve (CN III) or Horner syndrome can produce ptosis with other signs — anisocoria, gaze deviation, or strabismus. Sudden onset is a neurological emergency.
Mechanical ptosis
A tumour, scar, or other mass weighing on the lid — for example an eyelid tumour or post-traumatic scarring. The cause must be addressed, not just "lifting" the lid.
Assessment in consultation
A complete ptosis assessment includes:
- Margin-reflex distance 1 (MRD1) — the standard measure to quantify ptosis.
- Levator function — determines the appropriate surgical technique.
- Side-to-side comparison — identifying asymmetry and its meaning.
- Bell's phenomenon (the eye rolls upward on closure) — relevant to corneal protection after surgery.
- Medical and neurological history — to screen for underlying disease.
Surgical techniques
Levator advancement / resection
The most common technique when levator function is preserved. The surgeon shortens or reattaches the levator aponeurosis to the tarsus, elevating the lid. The approach can be external (through the crease) or internal (transconjunctival) depending on the case.
Müller muscle conjunctival resection
Suited to mild ptosis with a positive phenylephrine test. The surgeon shortens Müller's muscle on the posterior surface of the lid, elevating it. No external incision.
Frontalis suspension
When levator function is very poor or absent (typically in severe congenital ptosis), a fascial sling or material is used to connect the lid to the frontalis muscle — when the patient lifts the brow, the lid rises. This is a specialised technique and typically co-managed with ophthalmology.
Ptosis surgery is eye surgery, not pure aesthetic surgery. A responsible plastic surgeon co-manages complex cases with ophthalmology — and does not "create a fold" over an unexplained ptosis without addressing the cause.
Frequently asked questions
Will ptosis resolve on its own?
Age-related ptosis and aponeurotic stretching do not self-resolve — these are progressive anatomical processes. Myasthenic ptosis can fluctuate through the day but needs medical treatment. Acute neurogenic ptosis sometimes partially recovers. No topical or massage regimen "cures" true ptosis.
Can I check for ptosis at home?
A simple test: take a front-facing photograph with a neutral expression and eyes open naturally. Compare the upper-lid position on each side and how much it covers the pupil. If the upper lid covers more than 2 mm of the upper pupil it may be ptosis that warrants assessment. Accurate diagnosis still requires an in-person examination.
Does ptosis surgery make the eyes "bigger"?
Ptosis surgery returns the upper lid to its normal anatomical position, so the eye looks more open than before. This is restoration of natural appearance, not "enlarging" the eyeball. The extent of change depends on the severity of the original ptosis.
How long until the result settles after ptosis surgery?
The main swelling resolves in 2–4 weeks, but lid position and symmetry settle fully at 3–6 months. During that time one side may temporarily look higher due to asymmetric swelling. Final assessment is at six months.
Will I have dry eye after ptosis surgery?
There is a temporary risk. The lid is elevated, and complete closure may be incomplete in the first few weeks, causing dryness. Most cases self-correct in 4–8 weeks as tissue adapts. Patients are prescribed artificial tears and lid-care guidance during this period. If dryness persists beyond three months, it needs re-evaluation.