Table 1.

Population prevalence (%) of main eye disorders

Eye disorder	No of cases in sample	Estimated population prevalence (95% CI)*	Estimated No of cases in population of 13 371 (95% CI)*
Cataract (lens opacity; one or both eyes; visual acuity <6/12)	451	30 (25.1 to 35.3)	4037 (3351 to 4723)
Had cataract surgery (one or both eyes)	162	10 (8.5 to 12.4)	1399 (1141 to 1657)
Age related macular degeneration (visual acuity <6/12)	133	8 (5.8 to 10.8)	1108 (776 to 1440)
Glaucoma (chronic open angle)	47	3 (2.3 to 3.6)	395 (306 to 485)
Suspected glaucoma	109	7 (5.4 to 8.4)	924 (719 to 1128)
Refractive error causing visual impairment (one or both eyes; visual acuity <6/12)	136	9 (7.0 to 11.4)	1228 (935 to 1521)

^*Weighted average of cluster specific prevalence measures; calculations take into account the two stage cluster random sampling design.