A visual acuity measurement of 20/100 indicates that an individual can see an object clearly at 20 feet that a person with standard vision can see clearly at 100 feet. In simpler terms, the individual needs to be significantly closer to an object to perceive it with the same clarity as someone with normal eyesight. For example, to read a sign clearly, a person with this level of vision would need to stand much closer to the sign compared to someone with 20/20 vision.
This level of visual acuity generally signifies a moderate degree of vision impairment. Understanding this measurement is important because it helps eye care professionals determine the extent of vision correction needed, whether through eyeglasses, contact lenses, or other interventions. Historically, the development of standardized vision charts and acuity measurements has allowed for a more precise assessment and management of visual impairments, leading to improved quality of life for individuals with vision problems.
