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Ophthalmology

Optic Disc Drusen

Optic nerve drusen are refractive, calcified nodules located within the optic nerve head. Optic nerve drusen can be mistaken for unilateral or bilateral disc edema and are often a source of diagnostic confusion. Although typically benign entities, optic nerve drusen can cause visual field defects and are associated with conditions that cause vision loss, such as central retinal artery occlusion and ischemic optic neuropathy. It is crucial to appropriately work up and follow this condition to est

v1 · Reviewed Nov 7, 2026 by Automated Clinical Reviewer (Strict Verbatim v1)
  • Optic nerve drusen can be mistaken for unilateral or bilateral disc edema and are often a source of diagnostic confusion.
  • Although typically benign entities, optic nerve drusen can cause visual field defects and are associated with conditions that cause vision loss, such as central retinal artery occlusion and ischemic optic neuropathy.
  • deeper or buried drusen may give the appearance of a swollen disc or edema (i.e., papilledema or bilateral disc swelling secondary to increased intracranial pressure) and require further evaluation and testing to confirm the diagnosis.
  • While drusen may give the appearance of disc edema or swelling, or pseudo papilledema, the presence of drusen does not exclude the presence of actual edema.
  • A critical differential to rule out is actual disc edema or papilledema (bilateral disc edema).
  • Complications include anterior ischemic optic neuropathy, retinal vascular occlusions, choroidal neovascular membranes, and flame disc hemorrhages.
  • Due to the complexity of diagnosis and potentially devastating consequences of disc edema, consultation with ophthalmology should be done promptly by the healthcare professional in cases of suspected optic nerve drusen.
  • On physical exam, superficial drusen can be seen without the aid of imaging modalities.
  • The nerve is classically described as having a "lumpy, bumpy" appearance.
  • The drusen appear as round, refractile bodies which may be yellow or white in color and located on the surface of or buried under the nerve.
  • Drusen are most commonly located on the nasal aspect of the disc.
  • Additionally, if there is asymmetric nerve involvement, patients may have an afferent pupillary defect.
  • Spontaneous venous pulsations and tortuous or anomalous vessel branching and caliber can be seen.
  • Particular attention should be paid to the disc microvasculature as there will often be peripapillary flame hemorrhages and a reddish hue of the disc in cases of true disc edema.
  • Additionally, in true edema, both retinal vessels and vessels at the disc margin may be obscured, while vessels are clearly visible in pseudo edema.
  • Imaging modalities include B-Scan ultrasonography, CT scan, fluorescein angiography, fundus autofluorescence, and optical coherence tomography (OCT).
  • For both superficial and deep drusen, ultrasound may demonstrate a highly echogenic focus at the disc, representing calcification.
  • CT has utility in showing calcified drusen; however, it can not detect noncalcified drusen.
  • Fundus autofluorescence will demonstrate optic nerve drusen as bright hyperfluorescent foci in the disc, revealing all visible and most buried drusen.
  • OCT will reveal nerve drusen as areas of irregular or spherical hyporeflective cores with a uniform internal structure and hyperreflective borders at the surface.
  • OCT with enhanced depth imaging provides superior visualization, with one study revealing a 100% detection rate of buried drusen compared to 82% by non-EDI OCT and 41% by ultrasound.
  • OCT can help track nerve fiber thinning that can predict visual field loss.
  • OCT will reveal NFL thickening in cases of the presence of disc edema.
  • Fluorescein angiography will reveal early diffuse hyperfluorescence with late leakage on and near the disc in cases of edema.
  • On B-scan, calcified drusen maintain signal intensity despite a decrease in the gain setting, while in cases of true edema, the signal intensity decreases as the gain decreases.
  • In the case of idiopathic intracranial hypertension, certain characteristic imaging findings on MRI can aid in diagnoses such as flattening of the posterior globe, kinking of optic nerves, empty sella, tonsillar ectopia, slit-like ventricles, and other findings.
  • Lumbar puncture is another key tool in diagnosing idiopathic intracranial hypertension.
  • visual field defects, including enlarged blind spots.
  • visual field testing.
  • Optic nerve drusen on their own do not necessitate treatment.
  • Typically, patients have a good visual prognosis, and drusen can be re-evaluated periodically.
  • There is no strong evidence for initiating treatment for those individuals without visual field loss, although treatment with IOP lowering therapy or optic nerve sheath fenestration has been undertaken in some cases.
  • treatment with IOP lowering therapy or optic nerve sheath fenestration has been undertaken in some cases.
  • Surgical excision and radial optic neurotomy have been attempted without evidence to back their utilization.
  • Complications associated with optic nerve drusen may require treatment.
  • These entities are treated with intravitreal injections of anti-VEGF medication, laser photocoagulation, and photodynamic therapy.
  • It is important to refer patients suspected of having nerve drusen to an ophthalmologist for further evaluation and testing to confirm the diagnosis, the patient appropriately followed, disc edema ruled out, and complications managed should they arise.
  • drusen can be re-evaluated periodically.
  • OCT can help track nerve fiber thinning that can predict visual field loss.
  • Patients should be educated that they will likely not experience visual symptoms in the presence of nerve drusen.
  • However, they are highly likely to develop some visual field defects detectable on visual field testing.
  • Patients should also be educated that there are rarely associated complications possible and that treatment and prognosis of complications depend on the nature of the complication.
  • Lastly, patients should understand that treatment options targeting nerve drusen are not widely available or well studied.
  • In addition to confirming the diagnosis, it is critical to rule out the concurrent presence of edema.
  • Patients must understand that although nerve drusen are usually not vision-threatening, they can cause visual field defects and have been associated with rare, potentially visually devastating complications such as anterior ischemic optic neuropathy and retinal vascular occlusions.
  • review
    Optic Disc Drusen. StatPearls [Internet] — Harris Ahmed, Leila Khazaeni — StatPearls Publishing, 2023

Decision support only. Verify against local protocols and current labeling. Source: www.ncbi.nlm.nih.gov