What does 20/20 vision indicate?

• A. It requires no correction
• B. It indicates near-sightedness
• C. It means perfect vision in all lighting
• D. It cannot be measured with Snellen chart

Answer: (A)

20/20 vision means normal distance visual acuity as measured with a Snellen chart. The top number shows the testing distance (usually 20 feet in the U.S.). The bottom number indicates the distance at which a person with normal vision can read that line. If you can read at 20 feet what a person with normal vision can read at 20 feet, your acuity is 20/20. This generally means no correction is needed for distance vision under standard testing conditions. It doesn’t guarantee perfect vision in all lighting or cover other visual skills like contrast, color, or peripheral vision. It also doesn’t support the idea that vision cannot be measured with Snellen, since that chart is specifically used for this measurement.