Visual acuity is commonly measured using the Snellen chart. This chart expresses vision as a fraction, comparing an individual’s ability to see at a specific distance to what a person with normal vision can see at the same distance. A measurement of 20/35 indicates that an individual can clearly see at 20 feet what a person with normal vision can see at 35 feet.
Clear vision is essential for many daily activities, including driving, reading, and recognizing faces. While 20/20 vision is considered optimal, 20/35 is often categorized as mildly impaired vision. This level of acuity may not necessitate corrective lenses for everyday tasks, but it can impact activities requiring sharper vision. Historically, standardized vision assessments like the Snellen chart revolutionized eye care, enabling more objective and consistent measurement of visual capability.