What is exophthalmos? Symptoms, causes & treatment

Exophthalmos is anterior displacement of the globe beyond the orbital rim, most commonly due to thyroid eye disease but also from infection, trauma, vascular lesions, and orbital tumors. Cardinal findings include eye bulging, eyelid retraction or swelling, conjunctival injection, exposure-related irritation, diplopia, and, in severe cases, optic neuropathy. Diagnosis is clinical and confirmed with exophthalmometry and orbital imaging when indicated. Management targets the cause and protects the cornea; therapies range from lubrication and systemic medications to urgent antibiotics, endovascular treatment, or orbital surgery.

Key Points

• Exophthalmos (proptosis) is a sign, not a diagnosis; thyroid eye disease is the leading cause in adults, while infection and neoplasm are critical considerations in children.
• Red flags include acute painful proptosis with fever, vision loss, color desaturation, an afferent pupillary defect, restricted motility with pain, orbital bruit, or recent trauma.
• Exophthalmometry values >20 mm or an interocular asymmetry >2 mm are abnormal and prompt imaging and etiologic work-up [1].
• Orbital cellulitis, retrobulbar hemorrhage, and carotid-cavernous fistula require urgent specialty management to prevent vision loss and intracranial complications.
• Thyroid eye disease treatments include smoking cessation, ocular surface protection, systemic immunomodulation (including FDA-approved teprotumumab), and staged orbital, strabismus, and eyelid surgery when stable.
• Exposure keratopathy and compressive optic neuropathy are the sight-threatening complications to detect and treat early.

Anatomy and Physiology

The orbit is a bony cavity housing the globe, extraocular muscles, lacrimal gland, orbital fat, vasculature, cranial nerves II, III, IV, V1, V2, and VI, and connective tissues. The optic nerve exits posteriorly through the optic canal. The orbital septum and eyelids protect the ocular surface. Forward displacement occurs when the volume of intraorbital contents (muscle, fat, fluid, blood, tumor) exceeds the fixed orbital capacity, driving the globe anteriorly. Hertel exophthalmometry measures the apex of corneal projection relative to the lateral orbital rim.

Etiology

• Thyroid eye disease (Graves orbitopathy)
• Infection: orbital cellulitis; invasive fungal sinusitis in immunocompromised hosts
• Trauma: retrobulbar hemorrhage; orbital fractures with hemorrhage/edema
• Vascular: carotid-cavernous fistula; orbital varix; cavernous sinus thrombosis
• Neoplasm: lymphoma; metastasis (e.g., breast, lung); cavernous venous malformation; meningioma; lacrimal gland tumors; rhabdomyosarcoma (pediatric)
• Idiopathic orbital inflammation (orbital pseudotumor) and IgG4-related ophthalmic disease
• Sinonasal and skull base lesions: mucoceles; encephalocele
• Congenital/developmental: capillary hemangioma; sphenoid wing dysplasia (neurofibromatosis type 1)

Pseudoproptosis (apparent bulging without true globe displacement) can result from high axial myopia, buphthalmos, contralateral enophthalmos, eyelid retraction, or facial/orbital asymmetry.

Pathophysiology

• Thyroid eye disease: Orbital fibroblasts overexpress the insulin-like growth factor-1 receptor; autoimmunity drives glycosaminoglycan deposition, edema, and adipogenesis, enlarging extraocular muscles and fat, raising orbital pressure, and displacing the globe. Optic nerve compression can occur at the apex.
• Infection/inflammation: Increased vascular permeability and edema expand soft tissues and extraocular muscles; abscess formation further increases volume and pressure.
• Vascular lesions: Arteriovenous shunting in carotid-cavernous fistula elevates venous pressure, causing orbital venous congestion, chemosis, and pulsatile proptosis.
• Hemorrhage: Rapid accumulation of blood behind the globe acutely elevates orbital compartment pressure, risking ischemic optic neuropathy.
• Tumors: Mass effect expands orbital volume and may displace the globe axially (intraconal) or nonaxially (extraconal).

Epidemiology

Exophthalmos occurs across ages and etiologies. Thyroid eye disease is the most common cause in adults and is strongly associated with cigarette smoking and Graves hyperthyroidism [2,3]. Orbital cellulitis is more frequent in children and often arises from acute bacterial sinusitis [4]. Vascular causes and neoplasms account for a substantial proportion of unilateral adult cases in specialty settings [1,5]. Precise US incidence figures vary by population and setting.

Classification

• Laterality: unilateral vs bilateral
• Onset/tempo: acute (hours–days), subacute (days–weeks), chronic (weeks–months)
• Displacement: axial (straight forward) vs nonaxial (directional displacement suggesting extraconal mass)
• Pulsatility and bruit: present (vascular) vs absent
• Symptoms: painful vs painless
• Activity (thyroid eye disease): active (inflammatory) vs inactive (fibrotic/stable)

Symptoms and Signs

• General

  • Bulging eye(s), eyelid retraction or swelling, conjunctival injection/chemosis
  • Ocular surface dryness, foreign body sensation, tearing, photophobia
  • Diplopia from extraocular muscle restriction
  • Pain or headache; pain with eye movement suggests inflammation/infection
  • Decreased visual acuity, color desaturation, relative afferent pupillary defect (optic neuropathy)
  • Increased intraocular pressure, especially in upgaze

• Thyroid eye disease

  • Bilateral or asymmetric proptosis; upper eyelid retraction and lag
  • Conjunctival injection over rectus insertions; periorbital edema
  • Restrictive strabismus (often inferior and medial rectus involvement)
  • Optic nerve dysfunction in apical crowding

• Orbital cellulitis

  • Fever, malaise, sinusitis symptoms; eyelid erythema/edema
  • Painful ophthalmoplegia, chemosis, decreased vision if severe
  • Proptosis and tenderness; possible subperiosteal/orbital abscess

• Carotid-cavernous fistula

  • Pulsatile proptosis with orbital bruit, “whooshing” tinnitus
  • Conjunctival arterialization, elevated IOP, cranial nerve palsies (III, IV, VI)

• Trauma with retrobulbar hemorrhage

  • Acute painful proptosis after injury or surgery
  • Tight orbit, decreased vision, afferent defect; rock-hard eyelids

• Neoplasm (e.g., lymphoma, cavernous venous malformation)

  • Gradual, painless unilateral proptosis
  • Nonaxial displacement suggests extraconal mass; palpable mass occasionally

• Idiopathic orbital inflammation/IgG4-related disease

  • Subacute painful proptosis; lacrimal gland enlargement; rapid steroid response (IOI)
  • Recurrent or bilateral involvement (IgG4); systemic features possible

Complications

• Exposure keratopathy, corneal ulceration, infectious keratitis
• Compressive optic neuropathy with permanent vision loss
• Restrictive strabismus and diplopia
• Glaucoma or ocular hypertension; venous stasis retinopathy
• Orbital compartment syndrome (hemorrhage/inflammation)
• Intracranial spread of infection (orbital cellulitis)

Diagnosis

Clinical evaluation

• History: onset/tempo; pain; fever; trauma; sinus symptoms; thyroid disease; cancer history; vascular symptoms (bruit, pulsatile tinnitus); smoking; medications; immunocompromised status.
• Examination:
  • Visual acuity, pupils (relative afferent pupillary defect), color vision, confrontation fields
  • Motility and ductions; diplopia profile
  • Eyelid position, lagophthalmos; conjunctival injection/chemosis
  • Cornea and tear film for exposure injury (link: keratitis management at /disease/keratitis)
  • Exophthalmometry (Hertel): >20 mm or asymmetry >2 mm is abnormal [1]
  • IOP in primary and upgaze; resistance to retropulsion; mass palpation
  • Auscultation for orbital bruit

Imaging and laboratory testing

• Imaging
  • Contrast-enhanced CT orbit/sinuses for acute infection/trauma; assesses bony anatomy and abscess
  • MRI orbit with and without contrast for soft tissue detail, optic nerve, apical crowding, neoplasm
  • CTA/MRA or catheter angiography for suspected carotid-cavernous fistula
  • B-scan ultrasonography for vascular lesions or intraorbital masses when CT/MRI unavailable
• Laboratory tests (guided by suspicion)
  • Thyroid function: TSH, free T4/T3; thyroid-stimulating immunoglobulin or TSH receptor antibodies for Graves orbitopathy [2,3]
  • CBC, blood cultures, inflammatory markers (CRP/ESR) for orbital cellulitis [4]
  • Fungal markers and urgent ENT evaluation in immunocompromised with invasive sinusitis
  • Serum IgG4 and lacrimal/orbital biopsy when IgG4-related disease suspected
  • Tissue biopsy for indeterminate masses or to exclude lymphoma/metastasis

Differential diagnosis

Treatment

Management is etiology-specific and prioritizes corneal protection and optic nerve preservation.

Medical management

• Ocular surface protection (all causes)

  • Preservative-free artificial tears qid–hourly; lubricant ointment hs; moisture chamber/sleep mask; eyelid taping for nocturnal lagophthalmos. Consider temporary bandage contact lens under ophthalmologist supervision.
  • Address exposure-related dryness; see dry eye guidance (/blog/dry-eye-syndrome).

• Thyroid eye disease (coordinate with endocrinology)

  • Risk modification: strict smoking cessation; optimize thyroid status; avoid radioiodine without steroid prophylaxis in active, moderate-to-severe disease [2,3].
  • FDA-approved therapy: teprotumumab-trbw (Tepezza) IV 10 mg/kg initial, then 20 mg/kg every 3 weeks for 7 additional doses (total 8 infusions) for active disease; monitor for hyperglycemia, hearing changes, muscle spasms, IBD exacerbation, and fetal risk [6].
  • Glucocorticoids (off-label, commonly used): IV methylprednisolone pulses for active moderate-to-severe disease (e.g., 500 mg weekly for 6 weeks, then 250 mg weekly for 6 weeks; cumulative ≤8 g); screen for hepatic/cardiovascular risks; oral prednisone 0.5–1 mg/kg/day as alternative with taper [2,3].
  • Adjuncts (off-label): mycophenolate mofetil; orbital radiotherapy (typical 20 Gy in 10 fractions) for motility inflammation; evidence and selection vary [2,3]. Selenium for mild active disease has been suggested in low-selenium regions [2].

• Orbital cellulitis

  • Hospitalize; begin IV broad-spectrum antibiotics targeting sinus pathogens and MRSA pending culture and imaging: e.g., ampicillin-sulbactam 3 g IV q6h or ceftriaxone 1–2 g IV q24h plus vancomycin 15–20 mg/kg IV q8–12h; add metronidazole 500 mg IV q8h for anaerobes if intracranial extension suspected; adjust per ENT/ID consultation [4,7]. Transition to PO when improved; typical total duration 14–21 days depending on severity and source control.
  • Urgent drainage of subperiosteal/orbital abscess when indicated; address sinus disease.

• Idiopathic orbital inflammation/IgG4-related disease

  • Oral prednisone 1 mg/kg/day with taper; steroid-sparing agents (e.g., methotrexate, mycophenolate) for relapsing disease; rituximab for IgG4-related disease per multidisciplinary care [5,8].

• Carotid-cavernous fistula

  • Endovascular closure by neuroradiology; temporizing IOP control and lubrication [5,9].

• Neoplasms

  • Lymphoma: external beam radiotherapy and/or systemic therapy per oncology.
  • Cavernous venous malformation: observation if asymptomatic; surgical excision when symptomatic/progressive.

• Retrobulbar hemorrhage

  • Emergent lateral canthotomy/cantholysis to decompress; systemic IOP-lowering and hemostasis; surgical exploration as needed.

Procedural and surgical management

• Urgent/emergent

  • Lateral canthotomy and cantholysis for orbital compartment syndrome (retrobulbar hemorrhage).
  • Orbital/ENT drainage for abscess in orbital cellulitis with compromised vision or large collections.

• Thyroid eye disease (staged in inactive/stable phase unless vision threatened)

  • Orbital decompression for disfiguring proptosis or compressive optic neuropathy; approaches tailored to disease pattern.
  • Strabismus surgery for stable restrictive diplopia.
  • Eyelid retraction repair/blepharoplasty for exposure and cosmesis.
  • Typical sequence: decompression → strabismus → eyelids [2,3].
  • Representative CPT codes: orbital decompression, strabismus surgery (eg, 67311–67335), lateral canthotomy (67700).

Special populations

• Pediatric

  • High suspicion for orbital cellulitis, subperiosteal abscess, and rhabdomyosarcoma with acute unilateral proptosis; obtain urgent imaging and specialty consultation.
  • Thyroid eye disease is less common but can occur; growth and psychosocial considerations weigh in surgical timing.

• Pregnancy/lactation

  • Avoid radioiodine; defer nonurgent radiotherapy and most immunomodulators. Teprotumumab carries fetal risk; use effective contraception during therapy and for a period after the last dose per label [6]. Prioritize lubrication and prism/occlusion for diplopia; consider surgery postpartum unless vision threatened.

• Immunocompromised

  • Invasive fungal sinusitis (e.g., mucormycosis) can present with painful proptosis and necrotic nasal findings; requires urgent amphotericin B and surgical debridement with multidisciplinary care.

Prognosis

Outcome depends on etiology, timeliness of diagnosis, and severity at presentation. Many patients with thyroid eye disease improve over time with risk-factor control and appropriate medical/surgical therapy, though residual diplopia or lid changes are common [2,3]. Orbital cellulitis generally resolves with prompt antibiotics and drainage; delay risks vision loss and intracranial spread [4]. Compressive optic neuropathy from any cause can lead to permanent deficits if decompression is not timely.

Prevention and Patient Counseling

• Do not smoke; smoking increases the risk and severity of thyroid eye disease and impairs response to therapy.
• Maintain euthyroid status with endocrinology follow-up if you have Graves disease.
• Seek prompt care for sinus infections to prevent spread to the orbit.
• Use protective eyewear during high-risk activities to reduce orbital trauma.
• For exposure symptoms, use frequent lubricating drops and nighttime ointment; elevate the head of bed; consider moisture goggles; avoid contact lenses during active inflammation.

When to Seek Immediate Care

• Sudden vision loss, new severe eye pain, or a dark curtain over vision
• Bulging eye after trauma, especially with severe headache or inability to open/close the eye
• Red, swollen eyelids with fever and pain when moving the eye
• New double vision with worsening bulging over days
• A pulsing, bulging eye with a “whooshing” sound in the head
• Inability to fully close the eyelids or a new corneal abrasion

References

1. Malik A, Pavesio C. Proptosis. StatPearls. 2024. https://www.ncbi.nlm.nih.gov/books/NBK559323/
2. American Academy of Ophthalmology. Thyroid Eye Disease Preferred Practice Pattern. 2022. https://www.aao.org/preferred-practice-pattern/thyroid-eye-disease-ppp-2022
3. Biousse V, Newman NJ. Thyroid Eye Disease. EyeWiki. 2024. https://eyewiki.aao.org/Thyroid_Eye_Disease
4. Chaudhry IA, Al-Rashed W, Arat YO. Orbital Cellulitis. StatPearls. 2023. https://www.ncbi.nlm.nih.gov/books/NBK507901/
5. Rootman J, Nugent RA. Diseases of the Orbit: A Multidisciplinary Approach. 3rd ed. Lippincott Williams & Wilkins; 2021.
6. TEPEZZA (teprotumumab-trbw) injection, for intravenous use. Prescribing Information. DailyMed. Updated 2024. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=5b4b0df3-2a3d-4a83-9b8d-8a6b3ed0d3d9
7. Rosenfeld RM et al. Clinical practice guideline (update): Adult sinusitis. Otolaryngol Head Neck Surg. 2015;152(2 Suppl):S1-S39. doi:10.1177/0194599815572097
8. Andrew NH, Kearney DJ, Selva D. IgG4-related ophthalmic disease: a clinical perspective. Eye (Lond). 2022;36(3):407-420. doi:10.1038/s41433-021-01679-9
9. Miller NR. Carotid-Cavernous Fistulas. EyeWiki. 2024. https://eyewiki.aao.org/Carotid-Cavernous_Fistula

Disclaimer: This article is for informational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified eye care professional about your specific condition. If you have sudden vision loss, severe eye pain, or an eye injury, seek emergency care immediately.