Hindsight is 20/20.Not!We've been conditioned to reflect upon the repercussions of a catastrophic life experience and lament, "If I only would have...Hindsight, is 20/20." Most of us are aware that 20/20 is an acuity index used to express normal vision (the clarity or sharpness of vision). That means if you have 20/20 vision, from 20 feet away, you see what most people can see from 20 feet away. The results we receive after we read the letters on the Snellen Eye Chart only measure what we see.