B scan or Bright Scan ultrasonography is a diagnostic imaging tool utilized when the view to the back of the eye, or posterior segment is hindered. The posterior segment of the eye is the back two-thirds of the eye and consists of the vitreous, retina, optic nerve, and choroid.

Why is a B-scan done?

B-scan ultrasonography (USG) is a simple, non-invasive tool for diagnosing lesions of the posterior segment of the eyeball. Common conditions such as cataracts, vitreous degeneration, retinal detachment, ocular trauma, choroidal melanoma, and retinoblastoma can be accurately evaluated with this modality.

How is B-scan done?

In B-scan ultrasonography, an oscillating sound beam is emitted, passing through the eye and imaging a slice of tissue; the echoes of which are represented as a multitude of dots that together form an image on the screen (see Image 2). The stronger the echo, the brighter the dot.

What is a-scan and B-scan in the eye?

A-scan and B-scan are both ultrasound exams used to evaluate the eye. A-scan and B-scan are both types of ultrasound examinations performed for an eye evaluation.