Hierarchical parameter clustering/dendrogram for the PACG subjects. Correlated features are grouped in the same cluster bounded by the red box in the dendrogram. ACA, anterior chamber area; ACD, anterior chamber depth; ACV, anterior chamber volume; ACW, anterior chamber width; AL, axial length; IArea, iris area; ICurv, iris curvature; IT, iris thickness; LV, lens vault; PD, pupil diameter.