Ferdinand Monoyer
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Ferdinand Monoyer | |
|---|---|
| Born | 9 May 1836 |
| Died | 11 July 1912 (aged 76) Lyon, France |
| Occupation | ophthalmologist |
Ferdinand Monoyer (9 May 1836 – 11 July 1912[1]) was a French ophthalmologist, known for introducing the dioptre in 1872.[2]

He invented the Monoyer chart, used to test visual acuity.[3] He inserted his name in the random letters of the chart. It appears when one reads vertically from bottom to top on each side.[4]