If a patient has "perfect" vision, what visual acuity would be recorded?

The term "perfect" vision typically refers to a visual acuity of 20/20. This means that the patient can see at 20 feet what a person with normal vision can also see at 20 feet. It serves as a benchmark for visual acuity standards, indicating clarity and sharpness in vision at a distance.

Visual acuity is expressed in a fraction, where the first number represents the distance of the eye chart from the patient (20 feet), and the second number indicates the distance at which a person with normal vision could read the same line. Thus, 20/20 vision represents normal visual performance.

Other values, such as 20/15 or 20/25, indicate better or slightly worse visual acuity than the standard of 20/20, respectively. For example, 20/15 indicates the patient can see at 20 feet what a person with normal vision sees at 15 feet, demonstrating above-average acuity. In contrast, 20/25 and 20/30 suggest decreased visual sharpness compared to 20/20. Overall, 20/20 serves as the established norm for defining "perfect" vision.