Self-reported visual impairment and impact on vision-related activities in an elderly Nigerian population: report from the Ibadan study of ageing.
BACKGROUND
Studies have shown an association between visual impairment and poor overall function. Studies from Africa and developing countries show high prevalence of visual impairment. More information is needed on the community prevalence and impact of visual impairment among elderly Africans.


METHODS
A multi-stage stratified sampling of households was implemented to select persons aged 65 years and over in the south-western and north-central parts of Nigeria. Impairments of distant and near vision were based on subjective self-reports obtained with the use of items derived from the World Health Organization multi-country World Health Survey questionnaire. Impairment was defined as reporting much difficulty to questions on distant and near vision. Disabilities in activities of daily living (ADL) and instrumental activities of daily living (IADL) were evaluated by interview, using standardized scales.


RESULTS
A total of 2054 subjects 957 (46.6%) males and 1097 (53.4) females responded to the questions on vision. 22% (n = 453) of the respondents reported distant vision impairment, and 18% (n = 377) reported near vision impairment (not mutually exclusive). Fifteen percent (n = 312), however, reported impairment for both far and near vision. Impairment of distant vision increased progressively with age (P < 0.01). Persons with self-reported near vision impairment had elevated risk of functional disability in several IADLs and ADLs than those with out. Distant vision impairment was less associated with role limitations in both ADLs and IADLs.


CONCLUSIONS
The prevalence of self-reported distant visual impairment was high but that for near visual impairment was less than expected in this elderly African population. Impairment of near vision was found to carry with it a higher burden of functional disability than that of distant vision.
Bekibele
Charles O
CO
Department of Ophthalmology, College of Medicine, University of Ibadan, Ibadan, Nigeria.
Gureje
Oye
O
D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009549:Nigeria / Q000453:epidemiology; D012650:Self Disclosure; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D014786:Vision Disorders / Q000453:epidemiology*; D019987:Persons with Visual Disabilities / Q000706:statistics & numerical data*
J Am Geriatr Soc. 1994 Mar;42(3):287-92
8120313
Br J Ophthalmol. 2002 Sep;86(9):951-6
12185113
Br J Ophthalmol. 2003 Jul;87(7):829-33
12812876
Ophthalmic Epidemiol. 1997 Jun;4(2):73-81
9243651
Ophthalmology. 2006 May;113(5):723-7
16650664
MMWR CDC Surveill Summ. 1999 Dec 17;48(8):131-56
10634273
Ophthalmology. 2006 May;113(5):728-34
16650665
Bull World Health Organ. 1995;73(1):115-21
7704921
Invest Ophthalmol Vis Sci. 2001 Jan;42(1):64-72
11133849
Bull World Health Organ. 2004 Nov;82(11):844-51
15640920
Ophthalmology. 1991 Aug;98(8):1310-5
1923372
Arch Ophthalmol. 2005 Jun;123(6):807-14
15955982
Invest Ophthalmol Vis Sci. 2004 Jan;45(1):71-6
14691156
Invest Ophthalmol Vis Sci. 2002 Nov;43(11):3393-8
12407148
Arch Ophthalmol. 1993 May;111(5):680-5
8489453
Arch Ophthalmol. 2001 Dec;119(12):1839-44
11735797
Optom Vis Sci. 1994 Dec;71(12):750-60
7898882
Br J Ophthalmol. 2000 Sep;84(9):948-51
10966942
BMC Ophthalmol. 2006 Jun 09;6:24
16764714
Invest Ophthalmol Vis Sci. 1999 Feb;40(2):280-8
9950585
Gerontologist. 1989 Jun;29(3):359-65
2788109
Invest Ophthalmol Vis Sci. 1997 Jan;38(1):72-82
9008632
Br J Ophthalmol. 2002 May;86(5):505-12
11973242
Invest Ophthalmol Vis Sci. 1997 Mar;38(3):557-68
9071208
Ophthalmology. 2001 Oct;108(10):1751-6
11581045
J Am Geriatr Soc. 2006 Nov;54(11):1784-9
17087709
Surv Ophthalmol. 2001 May-Jun;45(6):531-48
11425359
Arch Ophthalmol. 2002 Jun;120(6):774-80
12049583