The prevalence of pterygium in Greater Beijing is approximately 3% among Chinese > or =40 years of age. Independent associations with living in a rural versus urban region, increasing age, and male sex suggested a correlation with outdoor work.
Retinitis pigmentosa with typical fundus appearance and functional loss may be present in about 1 out of 1000 elderly Chinese in Northern China. Calculated for the whole population in China, the figure would be 1.3 million patients with retinitis pigmentosa.
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