Table 1.

Anterior segment parameters measured by anterior segment optical coherence tomography and their definitions.

Parameter	Definition
Anterior Chamber Depth (ACD)	The axial distance from the corneal endothelium to the anterior lens surface.
Anterior Chamber Width (ACW)	The distance between the 2 scleral spurs.
Anterior chamber angle (ACA)	The trabecular–iris angle measured with the apex in the iris recess and the arms of the angle passing through a point on the trabecular meshwork at 500 μm from the scleral spur and the point on the iris perpendicularly opposite 5.
Angle Opening Distance at 750 μm (AOD750)	The distance between the posterior corneal surface and the anterior iris surface on a line perpendicular to the trabecular meshwork, 750 μm from the scleral spur.
Trabecular Iris Space Area at 750 μm (TISA750)	The surface area of a trapezoid with the following boundaries: anteriorly, the angle opening distance at 750 μm from scleral spur; posteriorly, a line drawn from the scleral spur perpendicular to the plane of the inner scleral wall to the iris; superiorly, the inner corneoscleral wall; and inferiorly, the iris surface.
Iris Curvature (I-Curve)	The perpendicular distance from a line between the most central to the most peripheral points of the iris pigment epithelium to the posterior iris surface at the point of greatest convexity.
Iris Thickness (IT)	Iris thickness at 750 ìm from the scleral spur (IT750).
Lens Vault (LV)	The perpendicular distance from the anterior pole of the lens to the horizontal line between the scleral spurs.