Table 2

Characteristics of glaucomatous field defects

(1) Asymmetrical across the horizontal midline (in early/moderate cases)
(2) Located in the mid-periphery (in early/moderate cases)
(3) Clustered in neighbouring test points
(4) Reproducible on at least two occasions
(5) Not explained by any other disease
(6) Considered a valid representation of the subjects functional status (based on performance indices such as false positive rate)