# One Eye on the Prize

The weird chart of letters you see here doesn’t spell out words. That poster is an “eye chart,” and eye doctors use it to figure out how well you can see. The 8th row of letters is the 20/20 row, which means someone with “20/20 vision” can read it from 20 feet away. If you can’t read them, but can read the bigger letters in the 20/30 row, your vision is 20/30: what you see at 20 feet, a 20/20 person can see from 30 feet. But what if you had superhero vision? Let’s do the math!

Little kids: If on a sign you can clearly see the 1st letter, the 4th, the 7th…which one do you think you can see next?  Bonus: The big initials on your friend’s backpack might be readable from 7 feet away… but if you have superhero vision that’s 10 times as strong, from how far away can you read those letters?

Big kids: If you have 20/20 vision but your friend has 20/40, that means you can see everything from twice as far. If your friend can read the ice-cream truck menu from 17 feet, from how far can you read it?  Bonus: If another friend has 20/60, that means you can read letters from 3 times as far. If you can read the baseball scoreboard from 123 feet away, how close does your 20/60 friend have to stand to see it?

The sky’s the limit: If you have 20/20 vision and your friend is 20/50, from how far can you read letters than your friend can see from 100 feet?

Wee ones: 8 rows of letters, including the 20/20 one!

Little kids: The 10th letter.  Bonus: 70 feet away.

Big kids: 34 feet.  Bonus: 41 feet.

The sky’s the limit: From 250 feet! Your vision is 5/2 as good as your friend’s (50 divided by 20).

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