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What is 30 30 vision?

Updated: 12/10/2022
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14y ago

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The two numbers are a ratio, known as the Snellen Ratio. The bottom number is the distance someone with normal vision can distinguish a reference. The top number is the distance the person being tested can distinguish that same reference. Therefore, 30/30 is the same as 20/20 (the usual way of saying someone has normal vision).

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14y ago
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