Hollenhorst Plaques: Why a Tiny Spot in the Eye Can Be a Big Warning Sign
During a comprehensive eye exam, your optometrist is not only checking your glasses prescription. The back of the eye can also reveal important clues about your overall health, including signs of blood vessel disease.
One finding that deserves attention is called a Hollenhorst plaque. It may look like a tiny, bright, yellow-orange spot inside a retinal artery, but it can signal a much larger issue involving cholesterol plaque, carotid artery disease, and stroke risk.
What Is a Hollenhorst Plaque?
A Hollenhorst plaque is a cholesterol embolus that becomes visible inside one of the small arteries of the retina. The retina is the light-sensitive tissue in the back of the eye, and it has a rich blood supply that can sometimes show signs of vascular disease elsewhere in the body.
These plaques usually come from cholesterol buildup in a larger artery, most commonly the carotid artery in the neck. A small piece of plaque can break loose, travel through the bloodstream, and lodge in a retinal artery.
EyeWiki describes a Hollenhorst plaque as a refractile cholesterol lesion within a retinal blood vessel, often seen in retinal artery occlusion cases. Carotid artery stenosis should be evaluated when retinal artery occlusion is suspected.
Why Are Hollenhorst Plaques Important?
A Hollenhorst plaque may not cause symptoms. Some patients have normal vision and no pain. That is why it can be discovered unexpectedly during a dilated eye exam or retinal imaging.
Even when the eye feels normal, the finding matters because it may be a warning sign of:
Carotid artery plaque
Atherosclerosis
High cholesterol
High blood pressure
Diabetes
Heart valve disease
Atrial fibrillation or other cardiac sources of emboli
Increased risk of stroke or transient ischemic attack
The Beaver Dam Eye Study found that people with retinal emboli had a significantly higher risk of stroke-related mortality compared with people without retinal emboli, even after adjusting for age, sex, and systemic risk factors.
What Symptoms Can Happen?
Many Hollenhorst plaques are asymptomatic, but symptoms can occur if blood flow to part of the retina is blocked.
Possible symptoms include:
Sudden painless vision loss
A gray, dark, or missing area in vision
Temporary vision loss in one eye
A curtain or shade over part of the vision
Blurry vision that comes and goes
Visual field loss
Temporary vision loss in one eye, sometimes called amaurosis fugax, can be a warning sign of reduced blood flow or embolic disease. EyeWiki notes that a complete ophthalmologic examination is important in transient vision loss and that cardiac and carotid sources may need to be considered.
What Does It Look Like During an Eye Exam?
During a dilated exam, a Hollenhorst plaque often appears as a small, shiny, yellow-orange reflective plaque inside a retinal arteriole. It is commonly found at a vessel bifurcation, where the artery branches and narrows.
Your optometrist may also look for signs of retinal artery blockage, including:
Retinal whitening
Narrowed arteries
Delayed blood flow
Boxcarring of the blood column
Cotton wool spots
Retinal hemorrhages
Signs of ocular ischemic syndrome
Additional testing may include retinal photography, OCT, OCT angiography, visual field testing, or referral for fluorescein angiography depending on the case.
Is a Hollenhorst Plaque an Emergency?
It depends on the situation.
If a Hollenhorst plaque is found and the patient has new vision loss, transient vision loss, neurologic symptoms, weakness, facial drooping, slurred speech, dizziness, or trouble walking, this should be treated as urgent and may require emergency evaluation.
If the plaque is found incidentally and the patient has no symptoms, it still requires prompt communication with the patient’s primary care doctor, cardiologist, or vascular specialist. The goal is to identify where the plaque came from and reduce future vascular risk.
A retinal embolus can be the eye’s way of showing that the vascular system needs attention.
What Medical Workup Is Typically Recommended?
The exact workup depends on the patient’s symptoms, age, medical history, and exam findings. Common recommendations may include:
1. Carotid Artery Evaluation
Because many Hollenhorst plaques come from carotid artery disease, a carotid ultrasound is commonly ordered to check for narrowing, plaque buildup, or reduced blood flow.
In ocular ischemic syndrome, EyeWiki notes that carotid duplex ultrasound is generally considered the first-line investigation for suspected carotid stenosis.
2. Cardiovascular Evaluation
Some emboli may come from the heart. Depending on the case, a doctor may recommend:
Electrocardiogram
Echocardiogram
Heart rhythm monitoring
Evaluation for atrial fibrillation
Cardiology referral
EyeWiki notes that echocardiography may be considered when a cardiogenic source is suspected or when a source of emboli has not been identified.
3. Blood Pressure, Cholesterol, and Diabetes Testing
Risk factor control is a major part of management. Your medical provider may evaluate:
Blood pressure
Lipid panel
Hemoglobin A1c
Blood sugar
Kidney function
Smoking history
Family history of vascular disease
4. Stroke or TIA Evaluation When Symptoms Are Present
If the patient has acute vision loss or neurologic symptoms, urgent stroke evaluation may be needed. Retinal artery occlusion is often considered an ischemic vascular event, and it should not be ignored.
How Are Hollenhorst Plaques Treated?
The plaque itself is usually not physically removed from the retina. Treatment focuses on finding the source and reducing the risk of future embolic events.
Management may include:
Primary care follow-up
Carotid imaging
Cardiology evaluation
Cholesterol management
Blood pressure control
Diabetes management
Smoking cessation
Antiplatelet therapy when prescribed by a medical doctor
Statin therapy when appropriate
Vascular surgery referral in selected cases with significant carotid stenosis
The American Society of Retina Specialists clinical guideline notes that carotid endarterectomy may be indicated in certain cases of significant carotid stenosis, while management depends on the degree of narrowing and overall clinical picture.
What Should Patients Do If One Is Found?
If your eye doctor finds a Hollenhorst plaque, do not panic, but do take it seriously.
Recommended next steps often include:
Ask whether there are signs of retinal artery blockage.
Report any history of temporary vision loss, stroke symptoms, or neurologic symptoms.
Follow up promptly with your primary care doctor or cardiologist.
Complete any recommended carotid or cardiac testing.
Work on cholesterol, blood pressure, blood sugar, and lifestyle risk factors.
Seek emergency care immediately if you develop sudden vision loss or stroke-like symptoms.
When to Seek Emergency Care
Call 911 or go to the emergency room immediately if you have:
Sudden vision loss in one or both eyes
Temporary blacking out of vision
Weakness or numbness on one side of the body
Facial drooping
Trouble speaking
Confusion
Dizziness with trouble walking
New severe headache
Loss of coordination
Eye findings can sometimes be the first warning sign of a larger vascular event.
How OPT-ISM Eye Care Can Help
At OPT-ISM Eye Care, we use comprehensive eye exams and retinal imaging to look beyond the glasses prescription. A detailed view of the retina can help detect signs of diabetes, high blood pressure, retinal disease, and vascular changes such as Hollenhorst plaques.
If a retinal embolus is found, we explain the finding clearly, document it with imaging when possible, and help coordinate appropriate medical follow-up.
Your eyes can reveal important information about your overall health. A small plaque in the retina may be tiny, but the message behind it can be very important.
Final Takeaway
A Hollenhorst plaque is a cholesterol embolus seen in the retinal blood vessels. It may not cause symptoms, but it can be associated with carotid artery disease and increased vascular risk. Finding one during an eye exam should lead to timely medical evaluation, especially when vision loss or neurologic symptoms are present.
A comprehensive eye exam can help protect both your sight and your overall health.
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