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What do you call those posters eye doctors use to test your eyesight?

enter image description here

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    You should keep inflamatory politics out of questions about English - surely this is not the only example you could find of such a chart. The "humour" is not appreciated here. (I've submitted an edit with a more neutral example, without affecting the nature of your question)
    – Grismar
    Commented Oct 27, 2022 at 0:40
  • @Grismar I couldn't google it since I didn't know what it's called, but I saw this meme Commented Oct 27, 2022 at 1:35
  • @Grismar by the way, your picture is of a different chart (with a different name) so strictly speaking you charged the question Commented Oct 27, 2022 at 2:22
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    I put "posters eye doctors use to test your eyesight" into google and found it. Please try harder
    – gotube
    Commented Oct 27, 2022 at 3:01

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These are called 'Snellen charts', or more generally an 'eye chart'.

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