Temporary vision loss in one eye — even if it lasted only seconds and resolved completely — is a red flag for carotid artery disease. A carotid ultrasound shows whether plaque is building up, and you can get one within days, at your home, without a referral.
Temporary vision loss in one eye is a red flag for carotid artery disease. A carotid ultrasound shows whether plaque is building up — and you can get one within days, at home, without a referral.
The medical term is amaurosis fugax — transient monocular vision loss. People describe it as a curtain or shade dropping over one eye, or a sudden graying out that resolves within seconds to minutes. It is painless. It passes. And it is one of the most important warning symptoms in cardiovascular medicine, because it indicates that something — typically a micro-embolus from the carotid artery — just temporarily blocked blood flow to the eye's retinal artery. The embolic source is still present. The question is what it is and how significant it is.
The most common cause of transient monocular vision loss is atherosclerotic plaque in the ipsilateral carotid artery — the carotid artery on the same side as the affected eye. The carotid artery branches into the ophthalmic artery, which supplies the retina. Plaque can release tiny fragments (micro-emboli) that travel up through this pathway and temporarily occlude retinal blood flow. When the embolus dissolves, vision returns. This is classified as a TIA equivalent: stroke risk is elevated, and the carotid artery is the source to evaluate first.
A central or branch retinal artery occlusion occurs when a larger clot or embolus blocks the retinal artery more substantially. If the blockage fully resolves, vision can return; if it persists, permanent vision loss results. Retinal artery occlusion is itself a stroke equivalent — and evaluation for the embolic source (carotid artery and heart) is the immediate next step.
High-grade carotid stenosis — significant narrowing of the carotid artery — can cause turbulent blood flow that fragments plaque material and sends it toward the brain or eye. Even without a vision episode, significant carotid stenosis carries substantial stroke risk. A carotid duplex ultrasound can directly visualize the artery wall, quantify plaque burden, and measure the degree of stenosis — providing the data needed to determine whether intervention is warranted.
A Carotid Duplex Ultrasound is the first-line imaging study after a vision episode of this type. It directly images both carotid arteries, identifies plaque, and measures stenosis severity. B-mode imaging reveals the artery wall and plaque morphology; Doppler measurements quantify blood flow velocity, which correlates with the degree of narrowing. The classification ranges from minimal disease to near-occlusion, and the results directly inform whether medical management alone is sufficient or whether a vascular surgery referral is indicated. Price: $397. No referral required.
If the carotid arteries are clear, a cardiac source should also be evaluated with an echocardiogram ($397) to rule out cardiac emboli from atrial fibrillation, valve disease, or structural abnormalities.
The traditional path: Ophthalmologist or PCP referral. Vascular surgery consult. Hospital imaging slot. In Southern Maine, carotid imaging through the hospital system typically involves a 2–6 week wait for an outpatient ultrasound appointment — longer if you're uninsured or self-pay.
The BPD path: Book online today. Emanuel Papadakis, RDCS, RVT, comes to your home in Southern Maine this week. A complete bilateral carotid duplex is performed in 30–45 minutes. Written results are delivered within 24–48 hours, with clear findings on plaque burden and stenosis classification — the exact data your physician or specialist needs to determine the next step.
Amaurosis fugax carries stroke risk equivalent to a classic TIA — estimated at approximately 1 in 5 within 90 days. The window between symptom and stroke is the window to find the source. Getting a carotid ultrasound this week is not overcaution — it is the right clinical response.
You'll lie on your back on a flat surface at your home. Emanuel will apply ultrasound gel to each side of your neck and move a small hand-held probe gently along the carotid artery — from the collarbone up to the jaw on each side. There are no needles, no radiation, and no discomfort. You can watch the artery images appear in real time on the screen. The exam takes approximately 30–45 minutes for a complete bilateral study.
The written report includes the degree of stenosis on each side (expressed as a percentage), plaque characterization, flow velocity measurements, and clinical interpretation. If significant findings are present, the report will note recommended follow-up. You'll have everything you need to act immediately.
Temporary monocular vision loss — sometimes described as a curtain dropping over one eye — is called amaurosis fugax. It is most commonly caused by a micro-embolus from carotid artery plaque temporarily blocking the retinal artery. When the embolus dissolves, vision returns. This is a TIA equivalent — a warning that carotid artery disease may be present and stroke risk is elevated.
If you are currently experiencing vision loss, facial drooping, weakness, or speech difficulty, call 911 immediately. If the episode has resolved, it is a high-priority warning that requires prompt evaluation — not an active emergency, but not something to wait months to address. Amaurosis fugax carries stroke risk comparable to a classic TIA.
A carotid duplex directly images the carotid artery walls, identifies plaque buildup, and measures the degree of narrowing (stenosis) and blood flow velocity. It can determine whether carotid artery disease is the likely source of your vision episode and how significant it is — information that directly guides treatment decisions.
Same-week appointments are available throughout Southern Maine with BlackPoint Diagnostics. No referral is required. Emanuel Papadakis, RDCS, RVT, comes to your home with hospital-grade portable equipment. Written results are delivered within 24–48 hours. The flat fee is $397 — all-inclusive.
Southern Maine · Mobile Service · This Week
A carotid ultrasound at your home this week can show whether plaque is present and how significant it is — before another episode occurs. $397. No referral. No hospital wait.
Book Your Carotid Ultrasound$397 · No Referral · Southern Maine · Evening & Weekend Availability
Package pricing available when combining multiple scans.