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In practise, like when you go for the driving test vision testing, the Snellen chart is tested at a distance of 6 metres because

It's the distance that matches refractive power of the eye to the size of the middle line of text

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It's the distance that matches refractive power specifically of the lens to the size of the top line of text

It's the distance that compensates for the decrease in light intensity with distance

It's the distance that matches refractive power of the eye to the size of the top line of text

It's just a convenient distance to use

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