<P> A reference value above which visual acuity is considered normal is called 6 / 6 vision , the USC equivalent of which is 20 / 20 vision : At 6 meters or 20 feet , a human eye with that performance is able to separate contours that are approximately 1.75 mm apart . Vision of 6 / 12 corresponds to lower , vision of 6 / 3 to better performance . Normal individuals have an acuity of 6 / 4 or better ( depending on age and other factors ) . </P>
<P> A reference value above which visual acuity is considered normal is called 6 / 6 vision , the USC equivalent of which is 20 / 20 vision : At 6 meters or 20 feet , a human eye with that performance is able to separate contours that are approximately 1.75 mm apart . Vision of 6 / 12 corresponds to lower , vision of 6 / 3 to better performance . Normal individuals have an acuity of 6 / 4 or better ( depending on age and other factors ) . </P>
what is the normal vision of human eye
what is the normal vision of human eye
20 / 20
20 / 20