20/20 Vision Is a Term Used to Express Normal Visual

Multiple Choice

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. If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance. In European countries (that use the international system of units) , the equivalent of 20/20 vision is

A) 6/6 vision
B) 7/7 vision.
C) 10/10 vision.
D) 40/40 vision.
E) 60/60 vision.