Prevalence of Blindness, Visual Impairment in Chao Nan Area, China
NCT ID: NCT04143334
Last Updated: 2019-10-31
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
3700 participants
OBSERVATIONAL
2012-04-01
2016-12-01
Brief Summary
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Detailed Description
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In the proposed study, we will examine 3700 Chaonan County residents aged 50 years and older, selected via a clustered, randomized sampling with probability proportional to size (PPS). The cluster will be at the village level, 50 subjects aged 50 years and older will be examined in each cluster includes Visual acuity, torch light, and fundus review, the major cause of blindness or visual impairment will be determined. We also randomly recruited 60% clusters,total 2250 participants, from RAAB survey to conduct a detailed conventional eye examination.
This study will provide a profile of blindness/visual impairment, avoidable blindness and cataract surgery service in Chaonan. we will evaluate the diagnostic accuracy of Rapid Assessment of Avoidable Blindness (RAAB) comparison with conventional survey. . It will provide important public health issues for the purposes of establishing a sustainable and suitable model to eliminate the cataract blindness in China.
Conditions
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Keywords
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Study Design
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OTHER
CROSS_SECTIONAL
Study Groups
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RAAB survey
We will examine 3700 Chaonan County residents aged 50 years and older, selected via a clustered, randomized sampling with probability proportional to size (PPS). The cluster will be at the village level, 50 subjects aged 50 years and older will be examined in each cluster includes Visual acuity, torch light, and fundus review, the major cause of blindness or visual impairment will be determined.
Conventional survey
conventional survey
All the recruited participants underwent ophthalmic examination according to the RAAB protocol and then 60% of them were re-examined with instruments in a mobile eye clinic set up in a village center on the same day. Examination in the mobile clinic included standardized visual acuity (VA) tests using logarithm of the minimum angle resolution charts, refraction, slit-lamp biomicroscopy, and dilated fundal examination with a binocular indirect ophthalmoscope.
Conventional survey
Interventions
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Conventional survey
Eligibility Criteria
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Inclusion Criteria
* In each household all persons , residing in the household for six months or more over the past year
* "Residing in the household" is defined as "sharing meals from the same kitchen with the other members of the household for at least 6 months in a year. Exclude any visitors.
Exclusion Criteria
* Visitors in the villages
* Residing in the household\< 6 months
50 Years
ALL
No
Sponsors
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Chinese University of Hong Kong
OTHER
Responsible Party
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ZHANG XIUJUAN
Dr. Principal Investigator
Principal Investigators
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XIUJUAN ZHANG, PhD
Role: PRINCIPAL_INVESTIGATOR
Chinese University of Hong Kong
References
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Li EY, Liu Y, Zhan X, Liang YB, Zhang X, Zheng C, Jhanji V, Xu P, Chang DF, Lam DS. Prevalence of blindness and outcomes of cataract surgery in Hainan Province in South China. Ophthalmology. 2013 Nov;120(11):2176-83. doi: 10.1016/j.ophtha.2013.04.003. Epub 2013 May 25.
Other Identifiers
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CRE-2011.389
Identifier Type: -
Identifier Source: org_study_id