What does 20/20 vision mean? When you visit your doctor or an eye care professional, you may be asked to read an eye chart. You may be told you have normal 20/20 vision. What does that really mean? An ...

And now a page from our "Sunday Morning" Almanac, January 18th, 1908, 107 years ago today . . . the day the Dutch ophthalmologist Herman Snellen died at the age of 73. You may not recognize his name, ...

Though dozens of different eye charts have been proposed by assorted experts in half a century, none has displaced the familiar Snellen chart, topped by its king-sized “E”. But this week the American ...

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 acuity ...