Prevalence of blindness and cataract surgery in Shunyi County, China

Zhao, Jialiang; Jia, Lijan; Sui, Ruifang; Ellwein, Leon B.

doi:10.1016/s0002-9394(98)00275-x

Cited by 97 publications

(79 citation statements)

References 7 publications

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“…Younger cataract blind people who could be more physically active are more likely to be operated for cataract than the elderly cataract blind population, although recruitment was not different between young (50-60) and old (60+). This finding is consistent to the findings of studies conducted earlier in China 5 and India, 6 7 where cataract surgery was found to be associated with younger age group. Although there is no difference in prevalence of blindness between sexes, cataract surgical coverage was higher in males (68.1%) than females (52.6%, OR 1.92, 95% CI 1.0 to 3.6).…”

Section: Discussionsupporting

confidence: 92%

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Prevalence of blindness and cataract surgery in Gandaki Zone, Nepal

Sapkota¹,

Pokharel²,

Nirmalan³

et al. 2006

British Journal of Ophthalmology

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Background/aim: Himalaya Eye Hospital (HEH), established in 1993, is rendering eye care services in the Gandaki and Dhaulagiri zones. The hospital has extensive community outreach activities along with services for outpatients, emergencies, and subspecialties such as vitreoretinal, paediatric, and low vision. The operation theatre is well equipped to match the surgical needs including phaco surgery for cataract. The hospital has performed more than 14 000 cataract surgeries and 250 000 treatment services during this period. The aim of this study was to estimate the prevalence of blindness, visual impairment, and cataract surgical coverage among the older adult population of three districts of Gandaki Zone, where 80% of the hospital's service recipients reside. Methods: People aged 45 years and older were enrolled in the study using a stratified cluster design. Subjects in 25 randomly selected clusters from the listed 806 were recruited through door to door visits. Each recruited subject had visual acuity (VA) and clinical examination conducted by an ophthalmologist. The survey was preceded by pre-pilot and pilot studies to refine the operational method. To assess quality assurance the interobserver variation in VA measurement was also carried out in five different clusters. Results: Out of 5863 selected subjects 85.3% were examined. Blindness defined as presenting VA ,6/60 in both eyes was found in 2.6% (95% confidence interval (CI): 2.2 to 3.9), whereas 16.8% individuals examined had vision ,6/19 in one or both eyes. Cataract was the principal cause of blindness in 60.5%, and refractive error was the dominant cause of vision impairment (,6/19) 83.3%. Cataract surgical coverage was 59.5% among the cataract blind and associated with younger age, literacy, and male sex. Conclusion: The finding suggests a positive impact of the HEH programme on the prevalence of blindness and cataract surgical services in the survey area. Strategies to further improve access and utilisation of facilities and increase cataract surgical coverage need to be developed.

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Section: Discussionsupporting

confidence: 92%

“…These findings are similar to previous studies from Nepal 4 and India. [5][6][7][8][9] A higher cataract surgical coverage among literates is also consistent with previous findings from Nepal 4 and India. [7][8][9] However, the principal study outcomes are from the area best served by HEH.…”

Section: Discussionsupporting

confidence: 90%

Prevalence of blindness and cataract surgery in Gandaki Zone, Nepal

Sapkota¹,

Pokharel²,

Nirmalan³

et al. 2006

British Journal of Ophthalmology

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“…The first national survey in mainland China estimated that the prevalence of blindness in people aged 60 years and older was 3.46% in 1987 [3]. The Shunyi County survey found that 2.65% of those aged 50 years and older were blind in 1985 versus and 1.7% in 1996 [4]. …”

Section: Introductionmentioning

confidence: 99%

The Prevalence of Visual Impairment in Older Adults in Mainland China: A Systematic Review and Meta-Analysis

Cheng

Cheng²,

Cai³

et al. 2012

Ophthalmic Res

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Purpose: This paper presents estimates of the prevalence of blindness and low vision among older adults over 50 years of age in mainland China. Methods: All primary reports of population-based studies that reported the prevalence or incidence of visual impairment among older populations in mainland China were identified. Twenty-four population-based studies were included in this systematic review. Blindness is defined as visual acuity of less than 3/60, or a corresponding visual-field loss to less than 10 degrees in the better eye with the best possible correction; low vision is defined as visual acuity of less than 6/18, but equal to or better than 3/60 in the better eye with the best possible correction. The pooled prevalence estimates of blindness and low vision were calculated assuming a random-effects model. Relative odds with 95% confidence intervals (95% CIs) were calculated, stratified by methodological and socioeconomic variables. Results: The overall pooled prevalence of blindness was 1.7% (95% CI 1.4–2.1). The results of the meta-regression showed the significance of a predictor variable: geographic region. The blindness rates per 100 older adults in various regions were 1.4 (0.9–2.0) in East China, and 1.4 (1.0–2.0) in Central China and 2.5 (1.9–3.2) in Western China. The overall pooled prevalence of low vision was 4.1% (3.4–5.1) and the independent pooled prevalence rates stratified by geographic region were 3.6% (2.6–5.1) in East China, 3.6% (2.4–5.2) in Central China and 5.2% (3.6–7.4) in Western China. Conclusions: Blindness or low vision affects approximately 5.8% Chinese adults older than 50 years. The prevalence of visual impairment, and especially blindness, vary greatly by the developmental status of geographic region.

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“…Bilateral vision condition was reported using the following five vision categories for both presented and best-corrected VA used in previous reports (16)(17) . Severe bilateral blindness: VA < 20/400 in both eyes.…”

Section: Classification Of Vision Categoriesmentioning

confidence: 99%

“…Some possible factors for this unbalanced gender distribution could be a greater participation of women in community groups and their higher life expectancy (14)(15) . The lack of standardization for the VA classification criteria and the difference in the studied sample composition contribute to the prevalence disparities in different studies, which follow the current criteria of presented VA and BCVA, unlike others which have used only presented VA (9) or pinhole acuity (16)(17)(18) . A major aspect is the classification of vision in more representative categories, so as not to underestimate the results (16,(19)(20)(21)(22) .…”

Section: Cataract Surgery Outcomesmentioning

confidence: 99%