Ultrasound biomicroscopy

Ultrasound biomicroscopy (UBM) is a type of ultrasound eye exam that makes a more detailed image than regular ultrasound.
Operation.
High-energy sound waves are bounced off the inside of the eye and the echo patterns are shown on the screen of an ultrasound machine. This makes a picture called a sonogram. 
Ocular use.
It is useful in glaucoma, cysts and neoplasms of the eye, as well as the evaluation of trauma and foreign bodies of the eye.