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Table 5 Classification of participants with glaucoma by levels of evidence (as described in Table 2)

From: A Population-based survey of the prevalence and types of glaucoma in Nigeria: results from the Nigeria National Blindness and Visual Impairment Survey

  Participants with glaucoma
Level of evidence Number of participants Number of eyes
Category 1
 VCDR 155 (22.7 %) 197 (20.8 %)
 VCDR asymmetry 113 (16.6 %) 113 (11.9 %)
 Total 268 (39.3 %) 310 (32.7 %)
Category 2
 VCDR 330 (48.4 %) 511 (53.8 %)
 VCDR asymmetry 43 (6.3 %) 43 (4.5 %)
 Total 373 (54.7 %) 554 (58.3 %)
Category 2b 5 (0.7 %) 10 (1.0 %)
Category 3 36 (5.3 %) 76 (8.0 %)
Total glaucoma 682 (100 %) 950 (100.0 %)
  1. VCDR vertical cup:disc ratio