Prevalence and associations of cataract in a rural Chinese adult population: the Handan Eye Study.

Background: Cataract remains the leading cause of blindness and visual impairment in the world and in China. However, data on the prevalence of cataract based on standardized lens grading protocols from mainland China are limited. This paper estimated the age- and gender-specific prevalence and risk factor for cataract

Methods: In a population-based Chinese sample, participants underwent a comprehensive ophthalmic examination, including assessment of cortical, nuclear, posterior subcapsular (PSC) and mixed lens opacities from slit-lamp grading using the Lens Opacities Classification System III.

Prevalence and causes of amblyopia in a rural adult population of Chinese the Handan Eye Study.

Objective: To determine the prevalence of and factors associated with amblyopia in a rural Chinese population.

Design: Population-based, cross-sectional study.

Participants: Six thousand eight hundred thirty Han Chinese aged 30 years or more, recruited from Yongnian County, Handan, Hebei Province, China.