Table 3

Performance indices of limbal chamber depth estimation in detection of gonioscopically occludable angles, primary angle closure, and primary angle closure glaucoma

Limbal chamber depthTraditional grade All occludable anglesPrimary angle closure with or without glaucomaPrimary angle closure glaucoma
Sensitivity %Specificity %Sensitivity %Specificity %Sensitivity %Specificity %
0% gradeNA17.899.629.399.252.298.9
⩾5% gradeNA60.596.170.793.791.392.6
⩾15% gradeGrade 183.785.784.582.491.381.1
⩾25% gradeGrade 299.265.510062.410061.1
⩾40% gradeGrade 310040.310038.310037.5
  • Traditional “van Herick” grades.5

  • Primary angle closure, those subjects with angles judged to be occludable on gonioscopic examination with either elevated intraocular pressure, peripheral anterior synechiae or a positive dark room, prone provocation test.

  • Primary angle closure glaucoma- those subjects with an occludable drainage angle and glaucomatous optic neuropathy, corroborated by visual field evidence in mild or moderate cases.