Visual acuity - Wikipedia, the free encyclopedia In the term "20/20vision" the numerator refers to the distance in ... 20/20vision can be considered nominal performance for human distance vision; 20/40 ...
2020vision and visual acuity 20/20 is commonly used for a pilot's license and 20/40 for a driver's license, ... 20/40vision in at least one eye is the vision required to pass the driving test ...
Vision and Vision Correction Having 20/20vision means seeing at 20 feet what a person with normal vision sees at 20 feet. ... 20/40vision can see at 20 feet what the person with normal vision ...