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Unilateral proptosis is when one eye protrudes forward more than the other because something increases volume or pressure inside the orbit. Causes range from inflammation and infection to bleeding, abnormal blood flow, and tumors. It can threaten vision if the cornea becomes exposed or the optic nerve is compressed. New or rapidly worsening unilateral proptosis should be evaluated promptly.
read more about unilateral proptosis ...The cause is often suggested by how quickly symptoms start. Acute onset is more concerning for infection, bleeding, or vascular problems, while slower progression raises concern for a mass or chronic inflammation.
Seek urgent care if proptosis occurs with eye pain, fever, reduced vision, or double vision. Limited eye movement, a new severe headache, or a tight swollen eyelid can signal a serious orbital process. Sudden bulging after trauma can indicate bleeding behind the eye. A new decrease in color vision or worsening visual field can suggest optic nerve compression.
Evaluation includes vision testing, pupil responses, eye movement testing, and a corneal check for exposure. Clinicians may measure protrusion with exophthalmometry and examine the orbit and sinuses. Imaging such as computed tomography or magnetic resonance imaging is commonly used to look for infection, mass, bleeding, or vascular changes. Thyroid testing may be added when thyroid eye disease is suspected.
Treatment depends on the cause and may involve antibiotics, steroids or other anti-inflammatory therapy, surgery, or vascular management. Lubrication and eyelid support can protect the cornea if the eye cannot close fully. Time-sensitive causes such as orbital cellulitis, hemorrhage, and vascular fistula need urgent specialist care. Do not delay evaluation when symptoms are new or worsening.
Yes. Proptosis and exophthalmos both describe forward displacement of the eye, and they are often used interchangeably. Clinicians may prefer one term depending on context.
It is urgent when it starts suddenly or comes with pain, fever, vision changes, double vision, or restricted eye movement. These signs can indicate infection, bleeding, or vascular disease that can threaten sight. Go to emergency care if symptoms escalate quickly.
It can. Thyroid eye disease often affects both eyes but may be noticeably asymmetric or appear unilateral early on. Because other causes can mimic it, a full evaluation is still important.
Common tests include a full eye exam with exophthalmometry and orbital imaging such as computed tomography or magnetic resonance imaging. Blood tests may include thyroid function testing when indicated. The exact workup depends on speed of onset and associated symptoms.
Exophthalmos. StatPearls (National Library of Medicine, National Institutes of Health). https://www.ncbi.nlm.nih.gov/books/NBK559323/. Date Accessed: February 18, 2026.
Nonspecific Orbital Inflammation. StatPearls (National Library of Medicine, National Institutes of Health). https://www.ncbi.nlm.nih.gov/books/NBK551670/. Date Accessed: February 18, 2026.
Exophthalmometry. American Academy of Ophthalmology EyeWiki. https://eyewiki.org/Exophthalmometry. Date Accessed: February 18, 2026.
Unilateral proptosis in a patient with thyroid eye disease: A case report. Madhur Bhattarai et al. https://pmc.ncbi.nlm.nih.gov/articles/PMC10392154/. Date Accessed: February 18, 2026.
When Patients Present With Bulging Eyes: A Case Series of Proptosis. Malaysian Family Physician. https://pmc.ncbi.nlm.nih.gov/articles/PMC12188229/. Date Accessed: February 18, 2026.