B-scan ultrasound is a diagnostic test used to assess various diseases of the eye. It is most useful when direct visualization of intraocular structures is not possible. In such cases, diagnostic B-scan ultrasound can give valuable information on the status of the lens, vitreous, retina, choroid, and sclera.
Ophthalmic ultrasonography uses high-frequency sound waves, which are transmitted from a probe into the eye. As the sound waves strike intraocular structures, they are reflected back to the probe and converted into an electric signal. The signal is subsequently reconstructed as an image on a monitor, which can be used to evaluate the eye and document pathology.
The exam is non-invasive. Although some patients may experience discomfort, it is generally a painless procedure.