Category 1* (structural and functional evidence) Eyes with CDR or CDR asymmetry ⩾97.5th percentile for the normal population combined with a visual field defect consistent with glaucoma. | Disc suspects. Those who met category 1 (but not category 2) disc criteria, but were not proved to have definite field defects. Field suspects |
Those with definite field defects, but not meeting category 1 disc criteria |
Category 2* (advanced structural damage where reliable field testing is not possible) Eyes with CDR or CDR asymmetry ⩾ 99.5th percentile for the normal population | Those with optic disc margin haemorrhages |
Those with an IOP ⩾97.5th percentile |
Category 3 (optic disc not seen because of media opacity) | Those with an occludable drainage angle (defined as one in which the pigmented/posterior trabecular meshwork could be seen for less than 120° of the angle circumference) |
(A) The visual acuity < 6/60 and the IOP >99.5th percentile (32 mm Hg) or |
(B) The visual acuity < 6/60 and the eye shows evidence of glaucoma filtering surgery |