Papilledema (optic disc swelling) is swelling of the area where the optic nerve enters the eye. It most often appears on both sides at once because of increased pressure inside the skull. It is not a disease of the eye itself but an important warning that something serious is happening in the head and that urgent examination is needed.
What papilledema is
The optic disc is the point where the nerve that carries the image from the eye to the brain joins the eye. When the pressure of the fluid inside the skull rises, it travels along the sheaths of the nerve and causes it to swell. The doctor sees this swelling when examining the back of the eye. The process is usually two-sided. Long-lasting swelling gradually damages the nerve fibres, so it is important to find and treat the cause as quickly as possible.
Causes
- Brain tumours that press on structures inside the skull.
- Idiopathic intracranial hypertension — raised pressure without an obvious cause, most often in young women who are overweight.
- Thrombosis of the brain’s venous sinuses (impaired blood outflow).
- Hydrocephalus — excess build-up of cerebrospinal fluid.
- Bleeding or inflammation of the membranes around the brain (meningitis).
- Certain medications that raise intracranial pressure.
Symptoms
- Brief episodes of blurred vision lasting a few seconds, often when bending over or changing body position.
- Headache that is worse in the morning, when coughing or straining.
- Nausea and vomiting.
- A pulsing sound in the ears, like a heartbeat.
- Double vision.
- Gradual, lasting loss of vision if the condition continues for a long time without treatment.
Why this is a neuro-ophthalmic condition
The eye here is not affected on its own — disc swelling is a result of a problem inside the skull. That is why you need a doctor who understands both the eye and the nervous system at the same time. This is exactly what a neuro-ophthalmologist does. They assess the state of the optic nerve and the field of vision while also searching for the cause of the raised pressure, referring the patient for the necessary tests and to related specialists (a neurologist, a neurosurgeon).
Diagnosis
- Examination of the back of the eye to assess disc swelling in both eyes.
- Visual field testing (perimetry) — swelling often narrows side vision.
- Optical coherence tomography (OCT) to measure the swelling and the state of the nerve fibres precisely.
- MRI of the brain and MR venography — to find a tumour, thrombosis or other causes.
- Lumbar puncture to measure intracranial pressure directly (in some cases).
Treatment
Treatment is always aimed at the cause. If it is a tumour, surgery or other treatment by a neurosurgeon is required. In idiopathic intracranial hypertension, medications that reduce fluid production are prescribed, along with weight loss; sometimes a shunt is placed. In thrombosis, blood-thinning therapy is used. The most important thing is to seek help early. While the nerve has not yet suffered lasting damage, vision can be fully preserved. The longer the swelling continues without treatment, the higher the risk of permanent vision loss. That is why any disc swelling calls for a quick search for the cause.
When to seek urgent care
Seek help immediately if you develop a severe or unusual headache together with blurred vision, nausea and vomiting, double vision, a pulsing sound in the ears, or any worsening of vision. The combination of these signs may indicate a dangerous rise in intracranial pressure, where delay threatens both vision and health.
German Eye Clinic, phone 0 800 507 670, the “Neuro-ophthalmologist consultation” service page.
