I’ve seen a chart shared on Facebook several times but I can’t find it. It compares the eye sizes to coin sizes. 18mm is a dime. 20mm is a penny. 22mm is a nickel. 24mm is a quarter. This is a great way to figure out the size of random eyes. Does anyone have that picture that I’m talking about? The closest I can find is this generic one on google. But the one I’m talking about mentions it in comparison to doll eye size.
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Why not just use a ruler and measure them?
Because I tend to have a coin in my pocket but not a ruler. 
I just looked… 18 mm and a dime is almost exact, 20 mm is a tiny bit larger than a penny, same with the nickel and 22 mm.
Dont have 24 mm eyes to test with a quarter.
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Thank you!!! 
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If you’ve got a phone with an internet connection, you can also try an online ruler! It should also work on a pc, but I don’t think many people have one turned on all the time, haha.
https://www.piliapp.com/actual-size/cm-ruler/
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Awesome thanks for sharing!!