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In Singapore, for example, rates of nearsightedness in three different ethnic groups — Chinese, Indian and Malay — have increased since Exposure to daylight helps the retina to release a chemical that slows down an increase in the eye's axial length, which is what most often causes myopia.

Animal studies show that during early development, if the eye is not allowed to regulate its size to the proper length, then myopia can occur.

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Since poor sight is associated with higher incomes and more schooling, it is less prevalent in rural areas of China.

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