TABLE 6. Evaluation of Tonometry Screening to Detect Glaucoma
in Population Studies
| Ferndale, Wales15 | Framingham, USA65 | Dalby, Sweden16 | Barbados, West Indies21 | St. Lucia, West Indies20 | Baltimore, USA66 | Rotterdam 200023 | Blue Mts. Eye Study24 | Melbourne VIP, 200026 | Proyecto VER27 | Aravind Eye Survey, 200328 | ||
| Age groups | 40–74 | 52–84 | 55–69 | 40–84 | 30+ | 40+ | 55+ | 49–97 | 40+ | 40–90+ | 40–90 | |
| Persons screened | 4090 | 2433 | 1511 | 4631 | 1667 | 5308 | 6281 | 3654 | 4744 | 4774 | 5150 | |
| IOP referral level/definition of high IOP | >20 | >21 | >20.5 | >21 | >21 | >21 | >21 | >21 | >21 | >22 | >21 | |
| Cases detected | New: 14 | New: 18 | New: 13 | New: 159 | All: 309 | All: 143 | All: 196† | New: 27 | 55 (def. & prob.) | 51 | 58 | 52 |
| Sensitivity | 50% | 50% | 38% | 74% | 63% | 63% | 47% | 11.1% | 30% | 24% | 20% | 30% |
| Specificity | 90% | * | <94% | 86% | 85% | 86% | 92% | 98.0% | 96% | 99% | 98% | 98% |
| Positive predictive value | 2% | 5% | >5% | 17% | 24% | 29% | 2% | 2.5% | 19% | 27% | 17% | 25% |