Table 1.

 Glaucomatous characteristics of optic disc and retinal nerve fibre layer (RNFL) as stated by the European Glaucoma Society (at least 1)

(1) Optic disc excavation—that is, undermining of the neural rim
(2) Notching involving ⩾2 clock hours
(3) Focal or diffuse atrophy of neural rim area involving ⩾2 clock hours
(4) Vertical cup to disc ratio >0.6
(5) Cup to disc asymmetry between fellow eyes >0.2
(6) Disc haemorrhage
(7) Baring of circumlinear blood vessels
(8) Focal or generalised atrophy of the RNFL.