Table 2.
International Society of Geographical and Epidemiological Ophthalmology (ISGEO) definitions for glaucoma used in analysis (Adapted From Foster, 2002) [13]
| 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 | |
VCDR vertical cup:disc ratio, RAPD relative afferent pupillary defect