Prevalence of Blindness, Visual Impairment in Chao Nan Area, China

Cataract Clinical Trial

Official title:

Prevalence of Blindness, Visual Impairment and Main Avoidable Causes in Chao Nan Area

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04143334
• Other study ID #: CRE-2011.389
• Status: Completed
• Start date: April 1, 2012
• Est. completion date: December 1, 2016

Study information

• Verified date: October 2019
• Source: Chinese University of Hong Kong
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

This study will provide a profile of blindness/visual impairment, avoidable blindness and cataract surgery service in Chaonan, mainland China. We also evaluate the diagnostic accuracy of Rapid Assessment of Avoidable Blindness (RAAB) comparison with conventional survey.

Description:

This proposal describes a population-based study aimed at determining the prevalence of visual impairment, blindness and major causes in adults age 50 years old and above in Chaonan County of Guangdong province, where one of the Project Vision Charity Eye center was founded in 2009.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 3700
• Est. completion date: December 1, 2016
• Est. primary completion date: December 1, 2015
• Gender: All
• Age group: 50 Years and older

Eligibility

Inclusion Criteria:

• aged 50 years and above

• 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:

• age <50 years old

• Visitors in the villages

• Residing in the household< 6 months

Related Conditions & MeSH terms

• Blindness
• Cataract
• Refractive Errors
• Vision Disorders
• Vision, Low
• Visual Impairment

Intervention

Diagnostic Test:
• Conventional survey

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
Chinese University of Hong Kong

References & Publications (1)

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. Epu — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	the prevalence of blindness and visual impairment (VI) and main avoidable causes in Chaonan, China	the prevalence of blindness and visual impairment (VI), and report the avoidable causes, including cataract in Chaonan Region, Guangdong Province, southern China	one year
Secondary	the diagnostic accuracy of RAAB	To evaluate the diagnostic accuracy of Rapid Assessment of Avoidable Blindness (RAAB)	one year

External Links

•   the Chinese university of Hong Kong