Article Text

PDF
Cataract visual impairment and quality of life in a Kenyan population
  1. Sarah Polack1,
  2. Hannah Kuper1,
  3. Wanjiku Mathenge2,
  4. Astrid Fletcher1,
  5. Allen Foster1
  1. 1London School of Hygiene & Tropical Medicine, London, UK
  2. 2Rift Valley Provincial General Hospital, Nakuru Town, Nakuru, Kenya
  1. Correspondence to: S Polack London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK; sarah.polack{at}lshtm.ac.uk

Abstract

Aims: To evaluate the World Health Organization Prevention of Blindness and Deafness 20-item Visual Functioning Questionnaire (WHO/PBD VF20), a vision-related quality of life scale, and to describe the relationship between cataract visual impairment and vision- and generic health-related quality of life, in people ⩾50 years of age in Nakuru district, Kenya.

Methods: The WHO/PBD VF20 was pilot tested and modified. 196 patients with visual impairment from cataract and 128 population-based controls without visual impairment from cataract were identified through a district-wide survey. Additional cases were identified through case finding. Vision- and health-related quality of life were assessed using the WHO/PBD VF20 scale and EuroQol generic health index (European Quality of Life Questionnaire (EQ-5D)), respectively. WHO/PBD VF20 was evaluated using standard psychometric tests, including factor analysis to determine item grouping for summary scores.

Results: The modified WHO/PBD VF20 demonstrated good psychometric properties. Two subscales (general functioning and psychosocial) and one overall eyesight-rating item were appropriate for these data. Increased severity of visual impairment in cases was associated with worsening general functioning, psychosocial and overall eyesight scores (p for trend <0.001). Cases were more likely to report problems with EQ-5D descriptive dimensions than controls (p<0.001), and, among cases, increased severity of visual impairment was associated with worsening self-rated health score.

Conclusion: The modified WHO/PBD VF20 is a valid and reliable scale to assess vision-related quality of life associated with cataract visual impairment in this Kenyan population. The association between health-related quality of life and visual impairment reflects the wider implications of cataract for health and well-being, beyond visual acuity alone.

  • EQ-5D, European Quality of Life Questionnaire
  • EuroQol, European quality of life
  • HRQOL, health-related quality of life
  • INDVFQ33, Indian VF33 questionnaire
  • PCA, principal components analysis
  • QOL, quality of life
  • SES, socioeconomic status
  • VA, visual acuity
  • VAS, visual analogue scale
  • VF, vision function
  • VRQOL, vision-related quality of life
  • WHO/PBD VFQ20, World Health Organization Prevention of Blindness and Deafness 20-item Visual Functioning Questionnaire

Statistics from Altmetric.com

Footnotes

  • Published Online First 31 January 2007

  • Funding: This study was funded by grants from Sight Savers International, Christian Blind Mission and ORBIS International.

  • Competing interests: None.

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.