Today, Google gives the inventor of eye test’s 181st birthday a wink with an animated doodle. Ferdinand Monoyer (9 May 1836 – 11 July 1912), a famous French ophthalmologist developed the diopter, the unit of measurement for vision still used by eye care professionals today. The diopter measures the distance you’d have to be from the text to read it.

Most notably, Monoyer devised an eye chart called the Monoyer Chart to test visual acuity. In the chart, every row represents a different diopter, from smallest to largest. Interestingly, Monoyer’s name is hidden among the letters in the chart, too.

Source: Google

Please follow and like us: