Table 5

Prevalence and incidence of visual impairment and blindness

Prevalence (1988)
No (%) 95% CI
Cumulative incidence (1988–99)
No(%) 95% CI
Presenting visual acuity better eye
Blind (<6/60)7 (2.6) ±1.915/263 (5.7) ±2.8
Visually impaired (6/24–6/60)18 (6.7) ±3.035/245 (14.3) ±4.4
Normal vision (>6/18)245 (90.7) ±3.5
Presenting visual acuity worse eye
Blind (<6/60)46 (17.0) ±4.526/224 (11.6) ±4.2
Visually impaired (6/24–6/60)31 (11.5) ±3.841/193 (21.2) ±5.8
Normal (>6/18)193 (71.5) ±5.4
  • This represents patients who have become blind or visually impaired in the 11 year period.