How common is bad eyesight? ( in countries were it can be tested/often measured)!

Question: How common is bad eyesight? ( in countries were it can be tested/often measured)?

I would like to know a fraction or percentage result, not just common or uncommon.

Answers:

according to an article i found about 64 percent wear glasses and 11 wear contacts

http://www.glassescrafter.com/informatio…

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How common is bad eyesight? ( in countries were it can be tested/often measured)!

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