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Table 3 Summary of completeness of data for participants undergoing full examination (N = 6397)

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

  Eye level data Person level data
  Right eye Left eye All eyes One/both eyes Both eyes
  N % N % N % N % N %
Total 6397   6397   12,794   6397   6397  
Examination
 Van Herick’s 5830 91.1 5821 91.0 11,651 91.1 5967 93.3 5684 88.9
 Intra-ocular pressure 5496 85.9 5478 85.6 10,974 85.8 5638 88.1 5336 83.4
 Disc grading
  Photo 4203 65.7 4242 66.3 8445 66.0 4631 72.4 3814 59.6
  Clinical 1320 20.6 1304 20.4 2624 20.5 1329 20.8 993 15.5
  None 874 13.7 851 13.3 1725 13.5 437 6.8