Figure 1.

UBM measurement method. (A) Measurement of the angle-opening distance (AOD) and the iridocorneal angle (ICA). The ICA represents the peripheral circumference of the anterior chamber, where the sclera, cornea, and base of the iris converge. The AOD was measured from the end of Descemet's membrane, which was used as an anatomical landmark to the anterior iris surface. (B) Measurements of the ciliary cleft width (CCW) and the ciliary cleft length (CCL). The CCW was measured by determining the distance between the root of the iris and the corneosclera. The CCL was measured by determining the distance between the angle recess and the middle point of the CCW. (C) Measurements of the ciliary cleft area (CCA). The CCA was measured as the area surrounded by the ciliary cleft.