What is a10 eye chart?

The A10 eye chart is a type of visual acuity chart used by eye care professionals to test a person's vision. It consists of 10 lines of letters or symbols in decreasing sizes, with the largest symbol at the top and the smallest at the bottom. The chart is designed to measure how well an individual can see at a distance of 20 feet, which is why it is often referred to as the Standard 20-Foot Snellen Chart. The A10 chart is used primarily in clinical settings and is one of the most commonly used eye charts worldwide. It is also frequently used in driver license examinations, job screenings, and school vision tests. The letters on the chart are typically black on a white background, with equal spacing between them. The A10 chart is considered a reliable and accurate tool for testing visual acuity as it can detect even small variations in visual function.