Amplitude scan or A-scan is a diagnostic procedure used to determine the internal characteristics of the eyes. The method uses an ultrasound system to generate eye measurements. After getting the measurements from the A-scan, a number of procedures can be conducted with precision. Cataract surgery planning and IOL power calculation are done with the help of axial measurements. Also, various eye defects can be detected and evaluated with the parameters obtained through A-scan. Measuring the eyes’ different characteristics due to comfort, precision, and accuracy has become increasingly popular.