The use of ultrasound frequencies in the 50-100 MHz range is a relatively new development in the ultrasound imaging of the eye. The term ultrasound biomicroscopy (UBM) have been applied to this new imaging technique because of similarities to optical biomicroscopy, i.e., the observation of living tissue at microscopic resolution. It is a non-specific imaging technique that can be used for any ocular pathology which fall within its penetration limits. It necessary to have knowledge of the normal appearance of ocular anatomical structures as imaged by UBM before pathological conditions can be analyzed. It provides a view of subsurface structures in their normal relationships without the distortion that occurs with preparation of histological specimens. It provides a foundation for future studies of specific glaucoma types, imaging adnexal pathology, assessing corneal and scleral diseases, the assessment of anterior segment trauma and for the diagnosis and management of anterior segment tumours.