How is visual acuity defined?

Visual acuity is defined as the sharpness of vision and detail recognition. It refers to how well a person can discern fine details and shapes at a specific distance. This measurement is crucial in assessing an individual's visual performance, often quantified using a Snellen chart during eye examinations. The ability to see details clearly is essential for various daily tasks, such as reading, driving, and recognizing faces.

Other factors like color vision and eye adaptation are important for overall visual perception, but they do not directly define visual acuity. The curvature of the cornea relates more to the eye's ability to focus light and can affect vision quality, but it is not a measure of visual acuity itself. Thus, sharpness and detail recognition is the core aspect that defines visual acuity.