Table 2.

Degree of glaucoma according to mean visual field defect.

Degree of Visual Field Damage	Cases of Confirmed or Probable Glaucoma
Advanced (MD < −11.9 dB)	10 (10.7%)
Moderate (MD −11.9 to −6 dB)	15 (16.1%)
Initial (MD > −6 dB)	58 (62.3%)
No reliable visual field available	10 (10.7%)
Total	93

Degree of glaucoma based on mean defect (MD) of the visual field. For this calculation, only cases of confirmed glaucoma and probable glaucoma were included. Most of glaucomas identified by the screening program had initial glaucomatous damage. VF: visual field, dB: decibels.