In this presentation from AAO 2016, Hiroshi Ishikawa, MD, talks about how both optical Coherence Tomography (OCT) and ultrasound Biomicroscopy (UBM) are useful in imaging anterior chamber angles. He discusses OCT versus UBM:

• The scleral spur is located more consistently with UBM.
• OCT has a higher resolution than UBM.
• Penetration is better with UBM than OCT.
• OCT can be used right after surgery.
• UBM can visualize structures behind the iris
• They are not competing modalitie,s but complimentary to each other.