Eye Procedures Eye ultrasound b-scan

Published on August 13th, 2012 | by ddeupree

Eye ultrasound

What is an eye ultrasound?

The eye ultrasound is an imaging technique that uses high-frequency sound waves, similar to sonar, used in oceanography. Ocular ultrasound is most commonly used to measure the eye’s axial length prior to cataract surgery. This measurement helps the cataract surgeon determine the best intraocular lens power and type for that particular eye. ┬áThis type of eye ultrasound is called A-scan

Ocular ultrasound is also used to exam the inside of the eye, especially when the doctor’s view is blocked by an opacity like a damaged cornea, a thick cataract or a hemorrhage inside the eye. This type of eye ultrasound is called B-scan.

Also see “Interactive Human Eye” animation

The technician will have you lie down on a table and you will be asked to close your eyes. A small amount of water-based jelly will be placed on your eyelid and a transducer with an eye cup on the end will be placed over the eye. The transducer is a small probe that sends the utrasound waves to the area of interest.

Click here to watch a Cataract Surgery animation

During the test, the technician may ask you to move your eye to different positions to get different ultrasound angles. You should continue to keep your eyes closed throughout the test. The technician will remove the jelly from your eye or eyes when the test is finished.

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