A-scan ultrasound biometry

A-scan ultrasound biometry is a diagnostic technique used primarily in ophthalmology to measure the dimensions of the eye, most importantly the axial length, which is crucial for determining the appropriate power of intraocular lenses (IOLs) for cataract surgery. The "A" in A-scan stands for "amplitude," and the A-scan technique generates a one-dimensional plot that displays the amplitude of echoes received from various structures within the eye as a function of time.