"This study aimed to evaluate the equivalence of a smartphone-based visual acuity chart with a standard 6-m Snellen visual acuity (6SVA) chart." Researchers first reviewed Snellen chart apps that were ...

Please provide your email address to receive an email when new articles are posted on . The Hadassah Self-Visual Acuity Screener demonstrated high reliability, accuracy and alignment with standard ...

Our formula for calculation of optotype size is also based on the arcminutes subtended by each letter, where we have calculated the ideal optotype size for a standard letter and combined this with ...

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 ...

Three visual acuity tests taken at home produce results comparable to those achieved with standard tests taken in the office, researchers say. All the tests are free. Two measure near vision, and the ...