Ophthalmologist Herman Snellen (1834-1908) was born on 19 February. His work to measure his patients' visual acuity led to his creation of the Snellen Chart, in 1862. Since its inception, more copies of the Snellen Chart have been sold in the United States than any other poster. I have miniature eyeglasses on my tie clip!
Thursday, February 19, 2026
Tuesday, February 27, 2024
Wednesday, January 25, 2023
25 January 23
January is National Eye Care Month, so I'm wearing my Snellen Eye Chart to inspire you to care for your eyes. Today marks the birthday of Johann Georg Klöppinger (1707-1786), of Pfungstadt, Germany. He and his wife Anna Margretha Schreiner (1710-1769) migrated to the American colonies in 1737, settling in the Pennsylvania "Dutch" countryside. They are (some of) my fifth-great-grandparents! They are the ancestors of everyone in America named Kleppinger or Clippinger or Klepinger -- except for more recent migrants like Renate Kloppinger of Tucson, AZ (one of my seventh cousins!). My tie clip for this special day holds a large K from my mother's jewelry.
Wednesday, January 19, 2022
19 January 22
January is "National Eye Care Month," on several very unofficial calendars. The American Academy of Ophthalmology lists special eye-related observances every month. Are you seeing clearly today? My Snellen eye chart tie will remind you to be sure to get your eyes checked regularly.
Friday, February 19, 2021
19 February 21
Herman Snellen (1834-1908) was a Dutch ophthalmologist who introduced the Snellen chart to study visual acuity. He took over directorship of the Netherlands Hospital for Eye Patients, after Franciscus Donders, (I wonders who Franciscus Donders was.)
Wednesday, February 19, 2020
19 February 20

Tuesday, February 19, 2019
19 February 19
Monday, February 19, 2018
19 February 18
Tuesday, January 24, 2017
24 January 17
Monday, September 21, 2015
Thursday, October 9, 2014
9 October 14
Wednesday, October 23, 2013
23 October 13







