The best replacement for 20 20 vision is 20 15.

The best alternatives to 20 20 vision are rated as following:
★★★★★  20 15
★  diopters

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Speaking about 20 20 vision, one probably shouldn't forget about astigmatism.

Other search terms related to 20 20 vision and their ratings are:
★★★★★ astigmatism
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Google Trends

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20 20 vision
20 15
diopters