What is a common tool used in vision training to measure visual acuity?

The Snellen chart is a standard tool utilized in vision training to measure visual acuity. It consists of rows of letters that decrease in size, allowing practitioners to determine how well an individual can see at a distance. The results from the Snellen chart provide a fraction that indicates the clarity of vision, comparing the individual’s eyesight to the standard vision at a specific distance—commonly 20 feet.

While other tests like the Astigmatism Test, Contrast Sensitivity Chart, and Color Vision Test assess different aspects of vision, they do not focus solely on measuring visual acuity. The Astigmatism Test identifies astigmatism, a refractive error, while Contrast Sensitivity evaluates the ability to discern differences in luminance. The Color Vision Test checks for color blindness or deficiencies in color perception, not the sharpness of vision. Therefore, the Snellen chart remains the primary method for measuring visual acuity in various settings, making it the correct choice.