Eye Ultrasound, A-Scan & B-Scan - Eye Imaging Test
Ultrasound uses high frequency sound waves to produce images of the internal eye structure. It is a helpful tool if cataract or vitreous clouding prevents a doctor from viewing the structures inside of your eye with traditional methods. A-scan and B-scan are two types of ultrasound tests. A-scan ultrasonography is used to measure the length from the cornea to the retina. B-scan ultrasonography is used to provide cross-sectional two-dimensional images of the inner eye.
You should arrange to have another person drive you home from your test. Following the procedure, you should not rub or touch your eyes for 30 minutes. There are no other special preparations for ultrasound examination.
Ultrasound is a quick and painless procedure. It is performed in your doctor’s office. For an A-Scan, your doctor will numb your eye with eye drops. A small transducer device is placed on your eye. The transducer transmits sound waves to a computer that produces images of the structures inside your eye. A B-scan is done through the closed eyelids and requires no preparation.
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The iHealthSpot patient education library was written collaboratively by the iHealthSpot editorial team which includes Senior Medical Authors Dr. Mary Car-Blanchard, OTD/OTR/L and Valerie K. Clark, and the following editorial advisors: Steve Meadows, MD, Ernie F. Soto, DDS, Ronald J. Glatzer, MD, Jonathan Rosenberg, MD, Christopher M. Nolte, MD, David Applebaum, MD, Jonathan M. Tarrash, MD, and Paula Soto, RN/BSN. This content complies with the HONcode standard for trustworthy health information. The library commenced development on September 1, 2005 with the latest update/addition on February 16, 2022. For information on iHealthSpot’s other services including medical website design, visit www.iHealthSpot.com.