One's visual acuity is an indication of the clarity or clearness of one's vision. It is a measurement of how well a person sees. The need for prescription eye glasses or contacts comes from the lack of the nominal 20/20 vision.
Though you may not have the best vision, you can gain confidence with the right eye care and receive the best visual performance achievable. Forget about the number and create your own vision. What's your visual acuity?