Which statement about B-scan ultrasonography is true?

Which statement about B-scan ultrasonography is true?

• A. It is used to measure axial length.
• B. It is used to assess color vision.
• C. It is used to diagnose glaucoma.
• D. It is used to detect ocular tumors.

Answer: (D)

B-scan ultrasonography provides two-dimensional imaging of the eye and orbit, especially useful when the back of the eye can’t be seen due to media opacities like dense cataracts or vitreous hemorrhage. This capability makes it a good tool for identifying and characterizing intraocular and orbital masses, including tumors, because the scan can show the size, shape, location, and internal characteristics of a lesion and its relationship to surrounding structures. Measuring axial length relies on a different ultrasound mode (A-scan) or optical biometry, not B-scan. Color vision is assessed with psychophysical tests, not ultrasound. Glaucoma diagnosis depends on intraocular pressure, optic nerve assessment, and functional testing like visual fields, rather than B-scan imaging.

B-scan ultrasonography provides two-dimensional imaging of the eye and orbit, especially useful when the back of the eye can’t be seen due to media opacities like dense cataracts or vitreous hemorrhage. This capability makes it a good tool for identifying and characterizing intraocular and orbital masses, including tumors, because the scan can show the size, shape, location, and internal characteristics of a lesion and its relationship to surrounding structures.

Measuring axial length relies on a different ultrasound mode (A-scan) or optical biometry, not B-scan. Color vision is assessed with psychophysical tests, not ultrasound. Glaucoma diagnosis depends on intraocular pressure, optic nerve assessment, and functional testing like visual fields, rather than B-scan imaging.