If you can read the lowest line in the image on the right, thank Herman Snellen! The Dutch ophthalmologist whose namesake chart is a mainstay of your annual eye exam was born #OnThisDay in 1834.

More on the history of the Snellen Chart: https://web.archive.org/web/20140717073050/http://www.ski.org/Colenbrander/Images/History_VA_Measuremnt.pdf

#histSTM #histmed 🗃️📜⚕️👀