What ultrasound technique primarily evaluates the anterior segment of the eye?

Biometry ultrasonography is the technique primarily used to evaluate the anterior segment of the eye. This method focuses on measuring the dimensions of ocular structures, such as the cornea, anterior chamber depth, lens thickness, and axial length. These measurements are crucial for various clinical applications, including preoperative assessments for cataract surgery and refractive surgery, as well as in diagnosing conditions like glaucoma and corneal issues.

The use of biometry ultrasonography specifically targets the anterior segment, allowing for precise evaluation of these structures, which are critical for maintaining proper visual function. It employs ultrasound waves to obtain measurements in a non-invasive manner, making it an essential tool in ophthalmic practice.

The other techniques, while useful in ocular imaging, serve different purposes. A-scan ultrasonography is mainly used for measuring the axial length of the eye, particularly in intraocular lens calculations, but is not focused solely on the anterior segment. B-scan ultrasonography provides a comprehensive view of both anterior and posterior segments but is generally utilized for assessing deeper structures and identifying pathology rather than specifically evaluating the anterior segment. Color Doppler imaging is primarily used to assess blood flow and vascular structures, which is outside the scope of evaluating the anterior segment directly.