Which Dutch ophthalmologist created the 20/20 vision test?
Visual excellence often is referred to as Snellen acuity. The chart and the letters are named for a 19th-Century Dutch ophthalmologist Hermann Snellen (1834 1908) who created them as a test of visual accuracy. Visual acuity refers to the clarity or clearness of one s vision, a measure of how well a person sees. The word acuity comes from the Latin acuitas, which means sharpness. Visual acuity is expressed as a fraction. The top number refers to the distance you stand from the chart. This is usually 20 feet. The bottom number indicates the distance at which a person with normal eyesight could correctly read the line with the smallest letters. Normal vision is considered 20/20. If your vision is 20/40, the line you correctly read at 20 feet could be read by a person with normal vision at 40 feet. Of course, just because 20/20 vision is normal doesn’t mean it’s perfect. A small percentage of the population is blessed with vision better than 20/20, and just recently researchers unveiled co
