A measurement of visual acuity, a certain standard indicates that an individual can see at 20 feet what a person with standard eyesight can see at 30 feet. This signifies slightly better-than-average visual clarity when assessed using a Snellen chart or similar vision testing tool. For instance, someone with this level of sight can discern details at a distance that others with typical vision might struggle to perceive.
Possessing enhanced visual sharpness offers advantages in various activities, including driving, reading, and participating in sports. Historically, quantifying eyesight has been crucial for occupations requiring keen observation, such as pilots and surgeons. Clear distance vision is fundamentally important for safe navigation and accurate performance in visually demanding tasks.