Changing Trends of Imaging in Angle Closure Evaluation

Figure 3

Ultrasound biomicroscopy image showing plateau iris with the classic double-hump sign. Contrary to angle closure on the basis of relative pupillary block, where indentation gonioscopy results in deepening of the peripheral anterior chamber, in plateau iris the iris contour follows the lens, dips posteriorly, then rises anteriorly before reaching the angle recess. The iris root remains angulated forward with a deepening of the anterior chamber confined to the region of the central iris. In this figure iridotrabecular contact (ITC) can be appreciated.