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Total number of visual fields per centre. Each centre is simply labelled 1–5 and represented by a specific colour. This colour coding is used throughout this report (every centre had data recorded between April 2000 and March 2015 apart from centre 5 where data were first recorded in May 2000).
| Centre 1 | Centre 2 | Centre 3 | Centre 4 | Centre 5 | |
| People, n | 3423 | 8459 | 27 921 | 18 636 | 15 555 |
| VF records, n | 16 162 | 65 355 | 285 552 | 113 847 | 121 523 |
VF, visual field.
