Fig. 15.

Pavlin’s measurement parameters (see Table 1). (A) The angle opening distance (AOD) is defined as the length of the line drawn from the point on the corneal endothelial surface 500 μm anterior to the scleral spur to the iris surface perpendicular to the corneal endothelial surface. The trabecular–iris angle (TIA, θ 1) is defined as an angle formed with the apex at the iris recess and the arms passing through the point on the meshwork 500 μm from the scleral spur and the point on the iris perpendicularly opposite. (B) The trabecular ciliary distance (TCPD) is defined as the distance between a point 500 μm from the scleral spur and the ciliary process on the line that is perpendicular through the iris. The iris thickness (ID1) is defined along this line, as is the iris–ciliary process distance (ICPD). Iris thickness also can be measured 2 mm from the iris root (ID2) and at its thickest point near the margin (ID3). The iris–zonule distance (IZD) is defined as a part of theTCPD at a point just clearing the ciliary process. The length of iris–lens contact (ILCD) and the angle at which the iris leaves the lens surface (iris–lens angle; ILA, θ 2) are easily measured.