The ability to see an object clearly at 20 feet indicates what?

The ability to see an object clearly at 20 feet indicates that the individual has normal vision. In ophthalmology, normal vision is often defined using the Snellen fraction, where a result of 20/20 means a person can see at 20 feet what a person with normal vision can also see at that distance. This serves as a baseline for visual acuity assessments.

In contrast, if a person has refractive error, they may struggle to see clearly at this distance without corrective lenses. Similarly, subnormal vision refers to a visual acuity worse than what is considered normal (20/20), while claiming perfect vision suggests the individual may have better than average visual acuity, such as 20/15 or better. Thus, the correct interpretation of seeing clearly at 20 feet is that the vision is functioning within the normal range.