Optic Disc Drusen vs Papilloedema: How to Tell Them Apart
Last updated: October 2026
Short answer: optic disc drusen can make a disc look swollen (pseudopapilloedema). Clues to drusen are a lumpy disc margin without vessel obscuration or venous congestion, and confirmation with autofluorescence, B-scan ultrasound or enhanced-depth OCT. True papilloedema shows obscured vessels, haemorrhages and venous congestion, and needs urgent investigation for raised intracranial pressure.
Clinical comparison
| Feature | Optic disc drusen | Papilloedema |
|---|---|---|
| Disc margin | Lumpy, bumpy | Blurred by oedema |
| Vessels over the disc | Clearly visible | Obscured by swollen nerve fibres |
| Disc colour | Often yellowish; no hyperaemia | Hyperaemic in early stages |
| Vessel pattern | Anomalous branching, trifurcations | Venous congestion and tortuosity |
| Haemorrhages | Occasional | Common (peripapillary, splinter) |
| Other signs | Calcified drusen may be visible in older patients | Paton lines (retinal folds), cotton-wool spots |
| Spontaneous venous pulsations | May be present | Usually absent, but absent in some normal people too |
Which test to use
- Fundus autofluorescence: superficial drusen glow brightly. Buried drusen may not show.
- B-scan ultrasound: calcified drusen are highly reflective and remain visible at low gain, with acoustic shadowing behind them.
- Enhanced-depth OCT: the best test for buried drusen, which appear as hyporeflective areas with a hyperreflective margin. OCT also measures peripapillary RNFL thickness.
- Fluorescein angiography: drusen show nodular late staining without leakage; papilloedema shows leakage from the disc.
- CT also shows calcified drusen, but should not be ordered just for this.
When in doubt
- Check blood pressure; malignant hypertension can cause bilateral disc swelling.
- If there are headaches, transient visual obscurations, pulsatile tinnitus or other neurological symptoms, treat it as papilloedema until proven otherwise and arrange urgent MRI with MR venography. See papilloedema.
- Drusen and papilloedema can coexist.
- Drusen can themselves cause visual field defects and increase the risk of NAION, so they need monitoring.
Frequently asked questions
What is the best test for buried optic disc drusen?
Enhanced-depth OCT is the most sensitive test for buried drusen. B-scan ultrasound is very useful for calcified drusen, and autofluorescence shows superficial drusen.
Does the absence of venous pulsation mean papilloedema?
No. Spontaneous venous pulsations are absent in some normal people. Their presence makes raised intracranial pressure less likely, but their absence alone proves nothing.
Can optic disc drusen cause vision loss?
Yes. Drusen can cause slowly progressive visual field defects and increase the risk of NAION, so patients need periodic visual fields and OCT.
Related: optic disc oedema, optic neuritis vs NAION vs AAION and OCT reading tips.
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