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vision 20/20

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You people may have known about that when you visit eye hospitals or eye centers for an eye examination. Eye health professionals will check your vision, Right?? If anyone has a normal vision, that will be denoted by 6/6 or 20/20. What actually is that 6/6 or 20/20 ?? To make you clear about 6/6 and 20/20 that both terms are equivalent. 6/6 is often used in countries that use metric units while 20/20 is used…

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