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 ...

What if you could give yourself a standard eye exam at home? That’s the idea behind [Joel, Margot, and Yuchen]’s final project for [Bruce Land]’s ECE 4760—simulating the standard Snellen eye chart ...

My graphic design students love to design posters using the classic eye chart composition, and they frequently ask “What typeface should I use for this?” Not having a definitive answer has always been ...

Visual acuity—the ability to discern letters, numbers, and objects from a distance—is essential for many tasks, from recognizing a friend across a room to driving a car. Researchers previously assumed ...

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, ...

Answer: We can credit Dr. Hermann Snellen, a Dutch ophthalmologist at the Netherlands Hospital for Eye Patients, with putting the big “E” on top of the eye chart in 1862. Snellen was trying to come up ...

Equation (1) is the derived equation from the standard definition of VA for computing the optotype size. I find it very interesting that authors found only 3 of 11 applications that had a measured ...