Google is celebrating the 181st birthday of French ophthalmologist’s Ferdinand Monoyer who invented the eye test with an animated Doodle the eyes and the visual acuity chart.
Monoyer, who was born in France in 1836, designed the way we measure eye sight. He grew up in Lyon and moved to the University of Strasbourg in 1871. He later returned to Lyon, where he died aged 76 in 1912.
He is best known for creating the Monoyer chart, as well as introducing the dioptre as a measurement for visual clarity.
“He developed the dioptre, the unit of measurement for the vision that’s still used today,” said Google. “The dioptre measures the distance you’d have to be from text to read it. Most notably, Monoyer devised an eye chart where every row represents a different dioptre, from smallest to largest.”