Droopy eyelids

Causes

• Dermatochalasis is loose, redundant eyelid skin, not a low lid margin; it is covered in detail in Upper blepharoplasty.
• Aponeurotic (involutional) ptosis is a stretched or disinserted levator tendon with normal muscle strength; candidates for tendon repair have levator excursion of 8 mm or more (PMID 1156224). Surgical repair of this type of ptosis is covered in Blepharoptosis repair.
• Brow ptosis can mimic or worsen eyelid ptosis: of 160 patients over age 50, 90% with horizontal forehead lines had ptosis against 76.67% without lines, and all 28 patients with one-sided forehead lines had ptosis on that side, because a drooping lid is often masked by chronic frontalis (forehead muscle) lift (PMID 30030561). After ptosis surgery releases that compensation, the brow itself can fall: in 93 patients the brow descended 5% or more after blepharoplasty in 61% of cases, more often in men and in eyes with more skin removed (PMID 39879807). Brow position and its own surgical treatment are covered in Browpexy and direct brow lift, Endoscopic brow lift, and Temporal and lateral brow lift.
• Congenital ptosis is present from birth, from a levator muscle that fails to develop normally. Whether the defect is true muscular dystrophy or dysgenesis (a developmental defect without true dystrophic change) is unsettled: a 1988 study found loss of cross striations, reduced fiber diameter, and nuclear changes consistent with dystrophy (PMID 3197871), while a later fiber-size study found no significant difference between normal and congenital-ptosis levator muscle (PMID 9614516) and a review of more than 35 published papers favored dysgenesis (PMID 12142765). A minority of cases have no muscle defect at all: in 287 eyes undergoing levator surgery for congenital ptosis, 27 eyes in 22 patients (9.4%) had an absent levator muscle at its normal insertion, with mean preoperative MRD1 of 0.44 mm and mean levator function of 8.56 mm (PMID 38429587). In 77 eyelids with congenital ptosis, muscle fibers were found in 83.33% of Marcus Gunn jaw-winking cases, 22.86% of simple congenital ptosis, and 16.67% of blepharophimosis-epicanthus inversus syndrome, and fibers were more often present with milder ptosis (PMID 29705893).
• Neurologic causes are less common but include conditions that need same-day recognition. Horner syndrome pairs ptosis with a small pupil on the same side; myasthenia gravis causes ptosis that worsens with fatigue and can be isolated in up to 22% of cases before other signs appear (PMID 37259693); third (oculomotor) nerve palsy causes ptosis with a misaligned or dilated eye, from causes that include schwannoma, meningioma, and radiation-induced neuromyotonia (PMID 32833860); chronic progressive external ophthalmoplegia (CPEO), a mitochondrial disease, causes slowly progressive ptosis with reduced eye movement in all directions, sometimes with cataract and corneal endothelial disease (PMID 33869891).

How it is diagnosed

• The core measurements are palpebral fissure height, marginal reflex distance (MRD1, the distance from the corneal light reflex to the upper lid margin), upper eyelid crease position, and levator function (how far the lid travels from down gaze to up gaze) (PMID 27329276).
• A 2022 diagnostic algorithm for acquired ptosis starts with a patient questionnaire, history, and photograph review, then checks onset, pupil size, and eye-movement function before ruling out serious disease, masquerade conditions, and pseudoptosis (PMID 35058403).
• Pharmacologic testing separates causes. The 0.5% apraclonidine test reverses the anisocoria of Horner syndrome and is more sensitive than the older cocaine test (93% against 40% in one series of 660 tests) (PMID 30804875); in a separate series of 31 Horner or diabetic-paresis eyes against 54 controls, apraclonidine dilated the affected pupil by a mean 2.04 mm against a mean 0.14 mm constriction in controls (p<0.001) and raised the affected lid by a mean 1.75 mm against 0.61 mm in controls (PMID 16234449).
• For suspected myasthenia gravis, bedside signs include Cogan's lid twitch, enhanced ptosis, the peek sign, and fatigue of the lid on sustained upgaze (PMID 29655447). The ice pack test (ice applied to the closed lid for 2 minutes) has a sensitivity of 86% and specificity of 79% against single-fiber EMG at 94% and 79% in 155 patients, and combining both tests raised sensitivity to 98% when either was positive (PMID 32788239). An unselected cohort study, designed to avoid the case-control bias that inflates earlier reports, found ice test sensitivity of 92% and specificity of 79%, with a negative predictive value of 94% (PMID 23536427).
• Of 60 patients referred for ptosis of unknown cause, 73% had aponeurotic ptosis and 17% had myasthenia gravis; every myasthenia gravis patient had either double vision or an abnormal eye exam finding, and none of the patients with isolated unilateral ptosis and an otherwise normal exam turned out to have myasthenia gravis (PMID 35686323).
• A 2025 American Academy of Ophthalmology report on ptosis-related drops found 26 qualifying studies: phenylephrine, cocaine, and hydroxyamphetamine are used only for in-office diagnosis, while apraclonidine, naphazoline, and oxymetazoline can also be used as treatment (PMID 40172501).
• A 2026 smartphone-based 3D measurement system, tested in 952 participants (1,904 eyes) across 5 hospitals, matched specialist measurement of MRD1 within a mean 0.52 mm and levator function within 0.95 mm, and classified surgical approach with an area under the curve of 0.98 (PMID 42783353).

Treatments

• Dermatochalasis alone is treated with skin excision; see Upper blepharoplasty.
• Acquired (aponeurotic) ptosis with normal levator function is treated with external levator advancement or Müller muscle-conjunctival resection; a meta-analysis of 1,038 eyelids found fewer reoperations after Müller muscle surgery than after levator advancement; see Blepharoptosis repair (PMID 36692699). Of 278 patients seeking blepharoplasty, up to 21% also needed ptosis correction, and adding it raised revision surgery from 3.8% to 9.2% (PMID 38315110).
• Poor or absent levator function (congenital ptosis, CPEO, third nerve palsy, severe myasthenic ptosis) is treated with frontalis suspension, which anchors the lid to the forehead muscle with a sling material rather than repairing the levator itself. In 25 eyes with severe ptosis and poor Bell's phenomenon, the leading causes were CPEO (44%) and third nerve palsy (28%), and silicone-rod suspension significantly improved palpebral fissure height and MRD1 (p=0.0001) (PMID 29034153). In 208 children with silicone sling suspension, mean MRD1 improved by 1.6 mm and 29% needed a repeat procedure, with higher reoperation in children under 3 (34% against 15%) (PMID 37364855). In 127 patients with unilateral poor-function ptosis (75 congenital, 10 third nerve palsy, 9 myasthenia gravis, 5 CPEO, and other causes), 95% achieved a good to excellent final eyelid height (PMID 16304515). In 51 eyelids with high-risk noncongenital ptosis (third nerve palsy, myasthenia gravis, CPEO, or oculopharyngeal dystrophy), eyelid height increased by a mean 2.8 mm and 39% of slings needed revision; outcomes were most favorable in the myasthenia gravis group (PMID 19966648). In 24 eyes of 12 CPEO patients, eyes with levator function over 4 mm had direct levator resection while eyes with poorer function had frontalis sling, and mean MRD1 rose from -0.54 mm to 2.42 mm at a mean 34-month follow-up (PMID 32847396).
• A nonsurgical option, an eyedrop that temporarily raises the lid, exists for acquired ptosis; see Upneeq and nonsurgical ptosis treatment.

Risks and complications

• Mistaking a neurologic cause for ordinary aging ptosis carries a distinct risk: oculomotor nerve palsy and Horner syndrome can signal an aneurysm, tumor, or carotid dissection, and myasthenia gravis can progress from ocular to generalized weakness (PMID 32833860, PMID 35686323).
• Frontalis suspension for poor-function ptosis carries a higher revision rate than tendon repair of aponeurotic ptosis: 29% to 39% across pediatric and high-risk adult series, most often for under- or overcorrection (PMID 37364855, PMID 19966648).
• CPEO ptosis surgery carries a risk of exposure keratopathy from reduced blink and eye movement; 4 of 24 eyes in one series developed mild to moderate exposure keratopathy, managed without further surgery (PMID 32847396).

Recovery

Recovery depends on which condition and which treatment apply. Skin-only surgery for dermatochalasis, tendon repair for aponeurotic ptosis, and frontalis suspension for poor-function ptosis each have their own healing course, covered in Upper blepharoplasty and Blepharoptosis repair. Eyedrop treatment works within hours and wears off by the next dose; see Upneeq and nonsurgical ptosis treatment.

Combined procedures

• Brow position and eyelid position interact: pooled data across 17 studies found brow height falls a mean 1.45 mm after any upper eyelid surgery (PMID 36890345), and in a separate series 61% of patients had measurable brow descent after blepharoplasty (PMID 39879807). A surgeon evaluating a droopy eyelid checks brow position before choosing eyelid surgery alone.
• Congenital ptosis with poor levator function is sometimes combined with a brow-fixation procedure rather than a levator procedure; complex congenital cases (blepharophimosis, Marcus Gunn jaw-winking, oculomotor palsy, congenital fibrosis of the extraocular muscles) accounted for 69 of 208 children in one frontalis suspension series (PMID 37364855).

Current questions

• Whether congenital ptosis is a true dystrophy or a developmental dysgenesis remains unresolved in the histologic literature, with studies on both sides (PMID 3197871, PMID 9614516, PMID 12142765).
• The yield of testing for myasthenia gravis in a patient with isolated, otherwise unremarkable ptosis is low; a 2023 series found none among 32 such patients (PMID 35686323).
• Bedside diagnostic tests for myasthenic ptosis (ice test, upgaze fatigue) perform similarly to single-fiber EMG but were validated mostly in case-control designs that likely overstate their accuracy (PMID 32788239, PMID 23536427).
• Smartphone-based 3D measurement of MRD1 and levator function is new as of 2026 and has not yet been tested outside its first multicenter study (PMID 42783353).

Terms

• Ptosis (blepharoptosis): the upper eyelid margin sitting lower than normal (PMID 27329276).
• Dermatochalasis: excess, lax eyelid skin, distinct from ptosis (PMID 35058403).
• Pseudoptosis: a droopy appearance without true ptosis, for example from brow descent or a small eye (PMID 27329276).
• MRD1: the distance from the corneal light reflex to the upper lid margin, the standard measurement of ptosis severity (PMID 42783353).
• Levator function: the distance the upper lid travels between down gaze and up gaze, used to choose the surgical approach (PMID 27329276).
• Aponeurotic ptosis: ptosis from a stretched or disinserted levator tendon with the muscle itself intact (PMID 1156224).
• Brow ptosis: a lowered eyebrow, which can compound or mimic eyelid ptosis (PMID 30030561).
• Frontalis suspension: eyelid surgery that anchors the lid to the forehead muscle with a sling, used when levator function is poor (PMID 16304515).
• Cogan's lid twitch: an overshoot of the upper lid on refixation from downgaze, a sign of myasthenia gravis (PMID 29655447).
• Apraclonidine test: eyedrops that reverse the pupil and lid signs of Horner syndrome, used to confirm the diagnosis (PMID 16234449).

Papers