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Table 2 International Society of Geographical and Epidemiological Ophthalmology (ISGEO) definitions for glaucoma used in analysis (Adapted From Foster, 2002) [13]

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

  VCDR or VCDR asymmetry     
Level of evidence Image reading analysis Clinical records analysis Visual fields Intraocular pressure Visual acuity Medical history
Other features
Category 1 ≥97.5th percentile: ≥97.5th percentile: Typical defect    
 VCDR 0.7 0.6
 VCDR asymmetry 0.1 0.2
Category 2 ≥99.5th percentile: ≥99.5th percentile: Not available    
 VCDR 0.75 0.7
 VCDR asymmetry 0.2 0.3
Category 2b ≤97.5th percentile: 0.7 ≤97.5th percentile: 0.6 ±Typical defect ≥99.5th percentile: 28 mmHg   RAPD, Corneal edema
Category 3 Not available   Not available ≥99.5th percentile: 28 mmHg <20/400 Surgery for glaucoma
  1. VCDR vertical cup:disc ratio, RAPD relative afferent pupillary defect