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Visual acuity is a measure of the clarity or sharpness of vision, often expressed as a fraction. In this case, the patient's acuity indicates they can see at 20 feet what a person with normal vision can see at 60 feet. Visual acuity is typically represented as a ratio of two numbers, where the first number represents the distance at which the patient can see a specific vision chart, and the second number represents the distance at which a person with normal vision can see the same detail.

For a person with normal vision, the standard reference point is often 20 feet. Therefore, if a patient sees at 20 feet what someone with normal eyesight can see at 60 feet, their vision is described in terms of a visual acuity of 20 over a greater distance. This translates to a visual acuity of 20/60. Essentially, the lower the second number, compared to 20, the better the visual acuity, indicating that the patient has diminished vision capability compared to normal sight.

Thus, being able to clearly see something at 20 feet that others would be able to see at 60 feet defines the visual acuity as 20/60. This classification indicates a need for correction, as the patient