Exophthalmos (bulging eyes)
Exophthalmos is forward protrusion of the eyeball caused by an increase in the volume of tissue inside the orbit.
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Medicines commonly prescribed for Exophthalmos (bulging eyes)
For informational purposes only. Always consult a doctor before taking any medication.
Dosage form: TABLET, 5 mgActive substance: carbimazoleManufacturer: Ferrer Internacional S.A.Prescription required
Exophthalmos is forward protrusion of the eyeball caused by an increase in the volume of tissue inside the orbit. The orbit is an enclosed bony space, so if something takes up more room inside, the eye has only one way to go: outwards. The most common cause is thyroid disease. This is not a cosmetic issue: there is a specific process behind exophthalmos, and in some cases vision is at stake.
How it shows up
- the eyes look larger and the gaze appears "startled" or staring;
- a strip of white is visible above the iris, between it and the upper lid;
- the eyelids do not close fully, particularly during sleep;
- gritty sensation, dryness, soreness, watering, light sensitivity;
- redness and swelling of the lids and conjunctiva;
- a feeling of pressure or fullness behind the eye;
- double vision, particularly on looking up or to the side;
- restricted eye movement;
- reduced vision and altered colour perception — a warning sign;
- the protrusion may affect both sides or only one.
Compare your photographs from one or two years ago: gradual changes in appearance are easiest to spot that way, and it helps the doctor a great deal too.
When urgent care is needed
- vision is deteriorating rapidly or colour perception has gone;
- severe eye pain has developed;
- the protrusion has increased over a few days;
- there is fever, the lids are red and swollen and eye movements are sharply painful — possible orbital cellulitis, a serious condition;
- double vision has appeared alongside severe headache;
- the protrusion followed an injury;
- a child's eye has started to protrude — always a reason for prompt assessment.
Causes
- thyroid eye disease in Graves' disease — the leading cause. Immune inflammation thickens the eye muscles and increases the fat within the orbit. It can occur with normal or even low thyroid function;
- inflammatory processes — orbital cellulitis, idiopathic orbital inflammation;
- orbital tumours — benign and malignant, including metastases;
- vascular causes — vascular malformations, cavernous sinus thrombosis;
- injury — orbital haemorrhage, surgical emphysema after a fracture;
- systemic conditions — sarcoidosis, granulomatosis with polyangiitis, IgG4-related disease;
- high myopia — the eye is anatomically longer and appears to protrude, though there is no true exophthalmos;
- cysts and sinus disease.
How it is investigated
The central question at the appointment is not "how far is the eye protruding" but "what is taking up space in the orbit". The assessment therefore runs in two directions: the orbit and the thyroid.
- measurement of the degree of protrusion with an exophthalmometer — giving an objective figure for comparison over time;
- assessment of visual acuity, colour vision, visual fields and eye movements;
- examination of the retina and measurement of intraocular pressure;
- thyroid hormones and TSH receptor antibodies — the antibodies confirm the thyroid origin best;
- CT or MRI of the orbits — showing thickened muscles, a tumour or inflammation;
- orbital ultrasound;
- specific tests if a systemic condition is suspected;
- biopsy if a tumour is suspected.
Treatment
The cause is treated and, in parallel, the eye is protected.
- normalising thyroid function — essential, though on its own it does not reduce the protrusion;
- stopping smoking — this is not general advice here but part of the treatment. Smoking substantially worsens thyroid eye disease and reduces the effectiveness of treatment. No other factor has as strong an influence;
- selenium in mild disease, as a course;
- intravenous corticosteroids during active inflammation;
- biologic therapy — modern drugs targeting the disease mechanism;
- orbital radiotherapy for specific indications;
- surgical orbital decompression when the optic nerve is at risk, or to correct appearance once the process has settled;
- eye muscle surgery for double vision;
- eyelid surgery so that the lids close properly;
- antibiotics for orbital cellulitis, usually in hospital;
- tumour treatment according to its nature.
The order matters: active inflammation is settled first, and only then, once the process is stable, are corrective operations performed.
What you can do
- stop smoking — the most effective single action within your control;
- lubricating drops during the day and a thicker gel or ointment at night;
- sleep with the head of the bed raised — this noticeably reduces morning swelling;
- sunglasses for light sensitivity and wind;
- cool compresses on the lids;
- tape the eyelids closed at night with a specific tape if they do not close, so the cornea does not dry out;
- temporarily cover one eye or use prisms for double vision — discuss this with an ophthalmologist;
- reduce salt if swelling is marked;
- check thyroid hormones regularly and do not miss doses;
- photograph your eyes once a month under the same conditions — the simplest way to track change.
Common questions
Will my eyes return to normal? Partly, after the inflammation settles. Complete return without surgery is uncommon, which is why decompression is discussed for marked protrusion.
Can it be treated with drops? Drops protect the surface of the eye but do not address the cause.
Why are my eyes still bulging when my thyroid is normal? These are separate processes. Orbital inflammation follows its own timetable and can continue after hormones have normalised.
How long does the active phase last? Usually six months to two years, after which the condition stabilises.
Does smoking really matter that much? Yes. It is the best-established fact in this whole area.
Online consultation
In an online consultation the doctor reviews photographs of your eyes over time, goes through the symptoms that indicate a threat to vision, checks thyroid hormones and antibodies, explains which orbital imaging is needed, and sets up a regimen to protect the cornea while you wait for an ophthalmology appointment.
This material is for information only and does not replace a medical consultation.
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Reviewed on Aug 9, 2026
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