An eye and orbit ultrasound uses high-frequency sound waves to measure and produce detailed images of your eye and eye orbit (the socket in your skull that holds your eye).
This test provides a much more detailed view of the inside of your eye than a routine eye exam.
An ultrasound technician or an ophthalmologist (a doctor who specializes in diagnosing and treating eye disorders and diseases) usually performs the procedure (sometimes called eye studies).
Eye studies can be done in an office, outpatient imaging center, or hospital.
Why do I need an eye and orbit ultrasound?
Your eye doctor may order eye studies if you’re experiencing unexplained problems with your eyes or if you’ve recently sustained an injury or trauma to the eye area.
This procedure is helpful in identifying issues with the eyes as well as diagnosing eye diseases. Some of the issues the test can help identify include:
tumors or neoplasms involving the eye
foreign substances
detachment of the retina
Risks of eye and orbit ultrasound
This is a quick and painless procedure with no serious side effects or risks.
How to prepare for an eye and orbit ultrasound
An eye and orbit ultrasound requires no specific preparation.
No pain is associated with the procedure. Anesthetic drops will be used to numb your eye and minimize discomfort.
Your pupils won’t be dilated, but your vision may be temporarily blurred during the test. You should be able to drive 30 minutes after the procedure, although you may feel more comfortable arranging for someone else to drive.
Your eye doctor will advise you not to rub your eyes until the anesthetic has completely worn off. That’s to protect you from unknowingly scratching your cornea.
How the procedure works
There are two parts to an eye and orbit ultrasound. The A-scan ultrasound takes measurements of your eye. The B-scan allows the doctor to see the structures in the back of your eye.
The combined procedure (A and B scans) will take 15 to 30 minutes to complete.
A-scan
The A-scan measures the eye. This helps determine the correct lens implant for cataract surgery.
While sitting upright in a chair, you’ll place your chin on a chin rest and look straight ahead. An oiled probe will be placed against the front portion of your eye as it’s scanned.
An A-scan can also be performed while you’re lying down. In that case, a fluid-filled cup, or water bath, is placed against the surface of your eye as it’s scanned.
B-scan
The B-scan helps your doctor see the space behind the eye. Cataracts and other conditions make it difficult to see the back of the eye. The B-scan also helps in the diagnosis of tumors, retinal detachment, and other conditions.
During a B-scan, you’ll be sitting with your eyes closed. Your eye doctor will put a gel on your eyelids. They’ll tell you to keep your eyes closed while you move your eyeballs in many directions. Your eye doctor will place the probe against your eyelids.
Results of eye and orbit ultrasound
Your ophthalmologist will review the results with you.
Your doctor will make sure the measurements of your eye taken from the A-scan are within the normal range.
The B-scan will give your doctor structural information about your eye. If results are abnormal, your doctor will need to determine the cause.
Some conditions that might be revealed by the B-scan include:
foreign bodies in the eye
cysts
swelling
detachment of the retina
damaged tissue or injury to the eye socket (orbit)
vitreous hemorrhage (bleeding into the clear gel, called the vitreous humor, that fills the back of the eye)
cancer of the retina, under the retina, or in other parts of the eye
Once your doctor reaches a diagnosis, they will work to determine the best course of treatment for you.
