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A retinal embolus is material that travels through the bloodstream and lodges in a retinal blood vessel. It can be made of cholesterol, calcium, or clot fragments and can partially or fully block blood flow. Some emboli are seen on exam as bright plaques, often called Hollenhorst plaques. A retinal embolus can cause transient or sudden vision loss and also signals increased risk of stroke or heart disease.
read more about retinal embolus ...Many retinal emboli originate from plaque in the carotid arteries, where small fragments can break off and travel to the eye. Emboli can also come from the heart, such as from valve disease, rhythm problems that form clots, or infection on a valve. Calcific emboli are more often linked to cardiac valves, while cholesterol emboli are often linked to atherosclerosis. Vascular procedures and severe systemic inflammation can raise embolic risk in some settings. Because the source influences stroke prevention decisions, medical evaluation focuses on finding where the embolus came from.
Some retinal emboli cause no symptoms and are found during a routine dilated eye exam. When symptoms occur, a common pattern is transient vision loss in one eye that lasts minutes, often described as a curtain or shade. A complete blockage can cause sudden painless vision loss or a missing area in the visual field. Vision changes can occur alongside neurologic symptoms when a broader vascular event is occurring. Any sudden change in one-eye vision should be treated as urgent.
Diagnosis is made with a dilated exam that can reveal an embolus within a retinal artery or signs of retinal artery occlusion. Retinal imaging and photographs can document the plaque and any areas of ischemic change. If vision loss is present, urgent evaluation is needed because retinal artery occlusion is managed like a stroke warning. Clinicians often order tests that look for carotid disease and heart sources of emboli, based on age and risk profile. The eye findings help guide how urgent the systemic evaluation should be.
There is no single eye drop that dissolves a retinal embolus, so care focuses on emergency assessment and prevention of future events. Sudden vision loss from retinal artery occlusion requires immediate medical evaluation, often through a stroke center pathway. Long-term management targets the embolic source with cardiovascular risk control, which can include antiplatelet or anticoagulation therapy when indicated by a clinician. Treatment of carotid disease or cardiac sources may be recommended depending on imaging and symptoms. Eye follow-up tracks for complications and documents any permanent retinal damage.
A Hollenhorst plaque is a bright cholesterol embolus seen in a retinal artery during an eye exam. It often comes from carotid artery plaque. Even without eye symptoms, it can signal vascular disease that needs medical evaluation.
Yes. A retinal embolus is a marker of systemic vascular disease and can be linked to carotid or cardiac sources that also raise stroke risk. Medical evaluation helps identify the source and guide prevention steps.
Vision can return after transient blockage, such as brief episodes of amaurosis fugax. Vision loss from a complete arterial occlusion can be permanent, especially when oxygen deprivation is prolonged. Early emergency care still matters, since the event also carries systemic risk.
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Hollenhorst Plaque. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK470445/. Date Accessed February 4, 2026.
Retinal Artery Occlusion. EyeWiki. https://eyewiki.org/Retinal_Artery_Occlusion. Date Accessed February 4, 2026.
Diagnosis and Management of Central Retinal Artery Occlusion. American Academy of Ophthalmology. https://www.aao.org/eyenet/article/diagnosis-and-management-of-crao. Date Accessed February 4, 2026.
Management of Central Retinal Artery Occlusion: A Scientific Statement From the American Heart Association. American Heart Association (Stroke). https://www.ahajournals.org/doi/10.1161/STR.0000000000000443. Date Accessed February 4, 2026.