| Monoyer chart | |
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 Monoyer chart. Reading upwards on both ends, but ignoring the first line, the name "Ferdinand Monoyer" can be seen
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| Purpose | test visual acuity |
The Monoyer chart was created by Ferdinand Monoyer and is used to test visual acuity. He inserted his name in the chart; reading upwards on both ends, but ignoring the first line, the name "Ferdinand Monoyer" can be seen.