スミソニアン博物館のインスタグラム(smithsonian) - 11月14日 07時51分

What's the smallest line that is a very good boy?
Dutch eye doctor Herman Snellen developed the most commonly used eye chart in the 1860s (the one with 11 rows of capital letters decreasing in size). Before his chart, people diagnosed their vision problems by themselves and picked the corrective lenses they thought worked for their vision.
Snellen also created the “Tumbling E” chart for patients who couldn't read or who didn't know the Roman alphabet, so they could say which way the E is facing instead of identifying letters.
Graphic designer Paul Rand transformed the chart with Yale bulldogs, the school mascot, and the letter Y for this poster in our @cooperhewitt's collection.

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