Background: The gold standard technique for estimating the anterior chamber angle (ACA) width is gonioscopy; however, there are certain disadvantages with this method, Recently, a number of instruments have been introduced to provide more precise, objective, and quantitative measurements of the anterior ocular segment. These instrument include anterior segment optical coherence tomography (AS-OCT )and Scheimpflug camera. Aim of the work: To compare between imaging devices;(AS-OCT) and Sheimpflug camera in (ACA) evaluation and assess the correlation between quantitative data obtained by them, qualitative data derived from gonioscopy. Results: No significant difference was found between AS-OCT ,Sirius Scheimpflug imaging and gonioscopy in measurement of anterior chamber angle (ACA). Conclusion: Rotating Scheimpflug camera and anterior segment OCT both are presumed to be very useful for the anterior chamber angle examination in normal open angles. They may provide good images and quantitative data about the angle structures.