How are ultrasound biometric measurements obtained?

Ultrasound biometric measurements are obtained by aligning the probe along the visual axis of the eye. This positioning is critical because it ensures that the ultrasound waves are directed optimally to penetrate the eye structures and provide accurate measurements of important dimensions, such as the axial length of the eye, which is essential for assessing refractive errors and determining the appropriate power of intraocular lenses for cataract surgery or other procedures.

By aligning with the visual axis, the ultrasound can accurately reflect off key anatomical structures such as the lens, vitreous body, and retina, enabling precise measurements. The effectiveness of the measurements largely relies on this alignment, as any deviation from the visual axis can lead to inconsistencies and inaccuracies.