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A-Scan & B-Scan Ultrasonography

AB ScanA terrific Ophthalmic ultrasonography service by our Fort Lauderdale office uses high-frequency sound waves, which are transmitted from a probe placed on 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 make a dynamic evaluation of the eye or can be photographed to document pathology.

A-Scans provide data on the length of the eye, which is a major determinant in common sight disorders. The most common use of the A-scan is to determine eye length for calculation of intraocular lens power to be inserted during cataract surgery.

B-Scans are an important adjuvant for the clinical assessment of various ocular and orbital diseases. It is most useful when direct visualization of intraocular structures is difficult or impossible. Situations that prevent normal examination include lid problems, dense cataracts, corneal scars and vitreous opacities or hemorrhages. In such cases, diagnostic B-scan ultrasound can accurately image intraocular structures and give valuable information on the internal structures of the eye. However, in many instances, ultrasound is used for diagnostic purposes even though pathology is clinically visible to better differentiate the pathology.