Eyelid

Congenital Ptosis

A droopy upper eyelid present from birth — usually from a poorly-developed levator muscle — and why timing of treatment matters for a child's vision.

Medically reviewed by Ronald W. Kristan, MD, FACSOculoplastic SurgeonLast updated June 2026

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Congenital Ptosis

Congenital ptosis results from a developmental dystrophy of the levator muscle itself — fibrosis replaces normal striated muscle fibers, leaving the muscle stiff and underpowered. Unlike aponeurotic ptosis, the levator function is poor from birth.

Clinical Features

Child with congenital ptosis of one upper eyelid — Congenital ptosis — a droopy upper eyelid present from birth.

Congenital ptosis with a poorly formed eyelid crease — Congenital ptosis is typically caused by a poorly developed levator muscle, so the eyelid crease is faint or absent.

Ptosis ranges from mild (lid partially covers pupil) to severe (pupil completely occluded)

Lid lag on downgaze is characteristic: because the fibrotic muscle cannot fully relax, the lid stays high when looking down — the opposite of acquired ptosis

Associated findings: amblyopia in about 30% of cases, along with strabismus and astigmatism

Children may tilt the head back into a “chin-up” posture to see under the drooping lid

When to Operate

Surgery is deferred until age 3–5 (“pre-school years”) when possible, so intraoperative cooperation is better and the child has had time for amblyopia treatment. However, when the lid occludes the visual axis and threatens vision development, correction must be performed earlier — even in infancy.

Surgical Treatment

Because the levator muscle works poorly from birth, the operation is chosen by how much function remains:

Frontalis (brow) sling — for poor levator function (≤ 4 mm): the standard repair for moderate-to-severe congenital ptosis. The eyelid is linked to the strong frontalis (forehead) muscle with a sling — the child’s own fascia lata (most durable, in older children) or a synthetic material such as silicone, Gore-Tex, or Supramid (allowing earlier surgery in infants) — so the lid is lifted by raising the brow. Sling materials →

Levator resection (external) — for fair function (5–9 mm): a measured length of the weak levator is shortened through a lid-crease incision to strengthen its pull.

Internal (Müller’s/conjunctival) approaches are reserved for the uncommon mild congenital ptosis with good function.

Why timing and technique matter: an eyelid that covers the pupil during the visual-development years (roughly the first decade) can cause permanent amblyopia (lazy eye) or astigmatism that glasses alone cannot fix. Vision is therefore protected first — with patching and, when the pupil is blocked, early surgery — while the most refined cosmetic and lid-contour result is optimized once the child is older and more cooperative. Because congenital lids do not relax normally, some lagophthalmos (incomplete closure) is expected after a sling and is managed with lubrication. Full treatment options →

Congenital ptosis is one of several congenital eyelid and orbital conditions evaluated in infancy and childhood.

Frequently Asked Questions

Is congenital ptosis dangerous for a child's vision?

It can be. If the lid blocks the pupil or induces astigmatism, it can cause amblyopia (lazy eye), so children with significant ptosis are monitored closely and may need earlier surgery.

When is congenital ptosis repaired?

When it threatens vision, surgery is done early; otherwise it is often timed before school age. Because the levator muscle works poorly, a frontalis sling is frequently used.

Congenital Ptosis