Visual acuity is defined as which of the following?

• A. Color perception
• B. Sharpness of vision at a given distance
• C. Depth perception
• D. Motion detection

Answer: (B)

Visual acuity refers to how sharp or clear vision is for fine details at a given distance. It measures the eye’s resolving power—the smallest detail you can distinguish and recognize. Clinically, this is usually tested with a Snellen chart at a standard distance. This concept is distinct from color perception (how well colors are distinguished), depth perception (judging distance in 3D space), and motion detection (noticing moving objects). So the best description is the sharpness of vision at a specified distance.