Table 1.

Classification of eyes based on severity of glaucoma.

Severity group	Characteristics
Suspect	1 or 2 of the following: IOP >21 mmHg; suspicious disc or C/D asymmetry of >0.2; suspicious 24-2 (or similar) VF defect
Early	Early glaucomatous disc features (e.g., C/D* <0.65) & (or) mild VF defect not within 10° of fixation (e.g., MD better than –6 dB on HVF 24-2)
Moderate	Moderate glaucomatous disc features (e.g., vertical C/D 0.7–0.85) & (or) moderate VF defect not within 10° of fixation (e.g., MD from –6 dB to –12 dB on HVF 24-2)
Advanced	Advanced glaucomatous disc features (e.g., C/D* >0.9) & (or) VF defect within 10° of fixation (e.g., MD worse than –12 dB on HVF 24-2)

C/D = cup-to-disk ratio; HVF = humphrey visual fields; MD = mean deviation; VF = visual field.