| Eye level data | Person level data | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
 | Right eye | Left eye | All eyes | One/both eyes | Both eyes | |||||
 | N | % | N | % | N | % | N | % | N | % |
Total | 6397 | Â | 6397 | Â | 12,794 | Â | 6397 | Â | 6397 | Â |
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 |