Visual acuity: Understand the concept of

Understand the concept of visual acuity and its significance in achieving clear vision. Explore factors that influence visual acuity and ways to maintain optimal eyesight 20/20 vision is a term used to express normal visual acuity; the clarity or sharpness of vision measured at a distance of 20 feet. Visual acuity is considered a measure of form sense & Visual angle is the angle subtended at the nodal point of the eye by the physical dimensions of an object in the visual field. What is visual acuity? Visual acuity measures how sharp your vision is at a distance. It is usually tested by reading an eye chart. How is visual acuity tested? The Snellen eye chart, with its familiar rows of letters in decreasing sizes, is the most common visual acuity test. While standing or sitting 20 feet from the chart, you are instructed to read each row until you no longer can. The Random E test uses a capital letter E that gets smaller in size and also changes direction (up, down ...