B-SCAN ULTRASOUND

WHAT IS A B-SCAN ULTRASOUND

A B-scan ultrasound is a safe and painless eye imaging test that uses sound waves to look inside the eye. It helps your ophthalmologist see important structures at the back of the eye when a direct view is not possible. For example, if a dense cataract, corneal opacity, or vitreous hemorrhage blocks the view, this test still allows internal evaluation. Instead of light, the device uses high-frequency sound waves to create a real-time image.

HOW A B-SCAN ULTRASOUND WORKS

During a B-scan ultrasound, a small probe gently touches the closed eyelid with a coupling gel. The probe sends sound waves into the eye, and these waves bounce back from internal tissues. Then a computer converts the echoes into a clear cross-sectional image. As a result, your doctor can assess the retina, vitreous, choroid, and posterior eye wall even when the media is cloudy.

WHEN DOCTORS RECOMMEND B-SCAN ULTRASOUND

Your ophthalmologist may request a B-scan ultrasound when the back of the eye cannot be seen well during routine examination. In addition, it helps confirm or rule out serious conditions. Common reasons include:

1. Suspected retinal detachment
2. Vitreous hemorrhage or dense floaters
3. Intraocular tumors or masses
4. Trauma to the eye
5. Advanced cataract before surgery
6. Posterior segment infection or inflammation

WHAT TO EXPECT DURING THE TEST

The procedure is quick and usually takes only a few minutes. First, the technician or doctor asks you to close your eyes. Next, a small amount of gel is placed on the eyelid. Then the probe is moved gently over the lid to capture images from different angles. You may be asked to look in certain directions to improve the scan. Most patients feel only mild pressure, not pain. Afterward, the gel is wiped off and you can return to normal activities right away.

BENEFITS AND SAFETY

B-scan ultrasound is noninvasive and does not use radiation. Therefore, it is considered very safe for adults and children. It provides rapid, real-time information that supports accurate diagnosis and treatment planning. Moreover, it often prevents delays in care when direct visualization is limited. Because results appear immediately, your doctor can quickly explain the findings and next steps.

LIMITATIONS OF B-SCAN ULTRASOUND

Although B-scan ultrasound is very useful, it does not replace all other eye imaging tests. For instance, it shows structure well but does not measure fine retinal detail like optical coherence tomography. Consequently, your doctor may still request additional imaging when needed. Each test answers a different clinical question.

WHY EARLY DIAGNOSIS MATTERS

Early and accurate detection of hidden eye problems improves treatment outcomes. With B-scan ultrasound, your ophthalmologist can see beyond opaque tissues and act sooner. As a result, sight-threatening conditions can be managed without unnecessary delay. If your doctor recommends this test, it plays an important role in protecting your vision.