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Brief Report
May 2018

Association of Visual Impairment and All-Cause 10-Year Mortality Among Indigenous Australian Individuals Within Central AustraliaThe Central Australian Ocular Health Study

Author Affiliations
  • 1Department of Ophthalmology, Flinders Medical Centre, Adelaide, South Australia
  • 2Department of Ophthalmology, Alice Springs Hospital, Alice Springs, Northern Territory, Australia
JAMA Ophthalmol. 2018;136(5):534-537. doi:10.1001/jamaophthalmol.2017.6787
Key Points

Question  What is the association of visual impairment (visual acuity worse than 6/12) with mortality risk among indigenous Australian individuals in remote central Australia, who experience the worst social disadvantage and morbidity in the country?

Findings  In this cohort study of 1347 remote indigenous Australian individuals, vision impairment was associated with 40% higher 10-year mortality after adjusting for age, sex, hypertension, and diabetes compared with normal vision.

Meaning  Visual impairment is associated with an increased mortality among remote indigenous Australian individuals, which is 3 times higher than that of the general population; efforts must be made to improve the ocular health of this highly disadvantaged group.

Abstract

Importance  It is well established from different population-based studies that visual impairment is associated with increased mortality rate. However, to our knowledge, the association of visual impairment with increased mortality rate has not been reported among indigenous Australian individuals.

Objective  To assess the association between visual impairment and 10-year mortality risk among the remote indigenous Australian population.

Design, Setting, and Participants  Prospective cohort study recruiting indigenous Australian individuals from 30 remote communities located within the central Australian statistical local area over a 36-month period between July 2005 and June 2008. The data were analyzed in January 2017.

Exposures  Visual acuity, slitlamp biomicroscopy, and fundus examination were performed on all patients at recruitment. Visual impairment was defined as a visual acuity of less than 6/12 in the better eye.

Main Outcomes and Measures  Mortality rate and mortality cause were obtained at 10 years, and statistical analyses were performed. Hazard ratios for 10-year mortality with 95% confidence intervals are presented.

Results  One thousand three hundred forty-seven patients were recruited from a total target population number of 2014. The mean (SD) age was 56 (11) years, and 62% were women. The total all-cause mortality was found to be 29.3% at 10 years. This varied from 21.1% among those without visual impairment to 48.5% among those with visual impairment. After adjustment for age, sex, and the presence of diabetes and hypertension, those with visual impairment were 40% more likely to die (hazard ratio, 1.40; 95% CI, 1.16-1.70; P = .001) during the 10-year follow-up period compared with those with normal vision.

Conclusions and Relevance  Bilateral visual impairment among remote indigenous Australian individuals was associated with 40% higher 10-year mortality risk compared with those who were not visually impaired. Resource allocation toward improving visual acuity may therefore aid in closing the gap in mortality outcomes between indigenous and nonindigenous Australian individuals.

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