The definition and classification of glaucoma in prevalence surveys

Abstract

This review describes a scheme for diagnosis of glaucoma in population based prevalence surveys. Cases are diagnosed on the grounds of both structural and functional evidence of glaucomatous optic neuropathy. The scheme also makes provision for diagnosing glaucoma in eyes with severe visual loss where formal field testing is impractical, and for blind eyes in which the optic disc cannot be seen because of media opacities.

Figures

Figure 1

The cumulative percentage of vertical CDR distribution among subjects able to complete visual field testing in a population survey in whom a reproducible visual field defect (glaucoma hemifield test “outside normal limits” and a four point cluster (p