The Snellen Eye Chart is one way to measure visual acuity Snellen visual acuity was named after Dutch ophthalmologist Herman Snellen and it was developed in 1862.

How is it used? The chart may be hung on a wall, or it may be projected onto a screen, so long as certain key requirements are met. The chart must be exactly 20 feet from the patient's eye, and the ...

January 18, 1908, is the anniversary of the death of Dutch ophthalmologist Herman Snellen, who created the familiar test for visual acuity And now a page from our "Sunday Morning" Almanac, January ...

Smartphone-based Snellen visual acuity charts has become popularized; however, their accuracy has not been established. This study aimed to evaluate the equivalence of a smartphone-based visual ...

For over one hundred years, various charts have been in use for this purpose, and the most commonly used one is the Snellen chart. It was designed by Herman Smelled, a Dutch ophthalmologist.