Ultrasound biomicroscopy (UBM) is a new imaging technique that uses high frequency ultrasound to produce images of the eye at near microscopic resolution. In cases of congenital glaucoma with corneal opacity and when gonioscopy becomes unfeasible, the value of UBM arises.This study was conducted on 26 eyes with congenital glaucoma. UBM could demonstrate associated congenital anomalies and differentiate different types of primary congenital glaucoma, especially Peter’s anomaly. Also could help to identify the type and to localize the site of previous surgery in congenital glaucoma. Thus assisting surgical planning for subsequent glaucoma management. UBM was found to be a useful method to demonstrate post operative complications in cases of congenital glaucoma associated with corneal opacity.