| Condition or Disorder | Intervention vs. Control | Outcome | Follow-up Duration | Event Rates % | NNT (95% CI) | |
|---|---|---|---|---|---|---|
| CER | EER | |||||
| Second-eye cataract surgery1 | Surgery vs. control | Difficulty reading normal print | 6 months | 35 | 6 | 4 (3 to 6) |
| Eyesight prevented most activities | 11 | 0 | 10 (6 to 23) | |||
| Below-average overall vision | 18 | 0 | 6 (4 to 10) | |||
| Eyesight interfered greatly in life | 26 | 1 | 5 (3 to 7) | |||
| Stereoacuity worse than 3000-sec arc | 70 | 12 | 2 (2 to 3) | |||
