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Overall, blindness prevalence rates ranged from 0.07% in CHES to 1.7% in the Atlanta VA Medical Center Chart Review. Figure 2 reports blindness prevalence from selected studies. Overall visual impairment prevalence rates ranged from 0.27% in MEPEDs to 7.5% in the 2005–2008 NHANES, which included older adults. Overall Vision Impairment and Blindness Prevalence Ratesįigure 1 shows the estimated total population prevalence rate for vision impairment derived from selected studies. The Relationship of Age-Related Maculopathy, Cataract, and Glaucoma to Visual Acuity The Cause-Specific Prevalence of Visual Impairment in an Urban Population. The Eye Diseases Prevalence Research GroupĬauses and Prevalence of Visual Impairment Among Adults in the United Statesīlindness, Visual Impairment and the Problem of Uncorrected Refractive Error in a Mexican-American Population: Proyecto VER.Ī Comprehensive Assessment of Visual Impairment in a Population of Older Americans. Prevalence and Risk Indicators of Visual Impairment and Blindness in Latinos: the Los Angeles Latino Eye Study. Varma R, Ying-Lai M, Klein R, Azen SP, et al. Veteran Eye Disease After Eligibility Reform: Prevalence and CharacteristicsĬhou, C.F., Cotch, M.F., Vitale, S., et al.Īge-Related Eye Diseases and Visual Impairment Among US AdultsĬhanges in Visual Impairment Prevalence by Period of Diagnosis of Diabetes: The Wisconsin Epidemiologic Study of Diabetic RetinopathyĬauses of Visual Impairment and Common Eye Problems in Northwest American Indians and Alaska Natives
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Visual Impairment in White, Chinese, Black, and Hispanic Participants from the Multi-Ethnic Study of Atherosclerosis Cohort Prevalence and Causes of Visual Impairment and Blindness in Chinese American Adults: The Chinese American Eye Study
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Figure 6.0 Vision Impairment and Blindness Prevalence Sources Author Vision Impairment and Blindness Prevalence Sources. BCVA is a person’s best distance vision while using optimal refraction correction (eye glasses, contact lenses, laser surgery).(Segre, 2015) There is no universal definition of visual impairment and there are varying definitions of BCVA, including 20/40 to 20/63 (mild VI), 20/80 to 20/160 (moderate VI), 20/200 or worse (severe VI).(Varma, 2004) Legal blindness is defined by the US government (to determine eligibility for vocational training, rehabilitation, schooling, disability benefits, low vision devices, and tax exemption programs) as 20/200 or worse, and by the World Health Organization as 20/400 or worse. Most studies in the United States measure visual acuity at a distance of 20 feet using the standardized Snellen Eye Chart.(Segre, 2015) Autorefractors may also be used to assess visual acuity and to estimate lens prescription. Vision impairment (VI) is generally determined by measuring the best-corrected visual acuity (BCVA) of the better-seeing eye. The VEHSS team conducted a review of published literature on examination-based population studies reporting the prevalence of vision impairment and blindness.