Figure 1 (A) Angle opening distance at 500 μm anterior to the scleral spur (AOD₅₀₀), defined as the distance from the corneal endothelium to the anterior iris perpendicular to a line drawn along the trabecular meshwork, at 500 μm from the scleral spur. (B) Area of recessed angle at 500 μm or 750 μm from the scleral spur (ARA₅₀₀, ARA₇₅₀), defined as the area bounded by the corneal endothelium, trabecular meshwork and anterior iris surface out to a distance of 500 μm or 750 μm from the scleral spur including the lake of fluid posterior to the scleral spur. (C) Trabecular‐iris space area up to 500 μm or 750 μm from the scleral spur (TISA₅₀₀, TISA₇₅₀), defined as the area bounded by the corneal endothelium, trabecular meshwork and anterior iris surface out to a distance of 500 μm or 750 μm from the scleral spur, excluding the lake of fluid posterior to the scleral spur.