What is the purpose of testing visual acuity?

The purpose of testing visual acuity is to measure clarity of vision, which refers to how well an individual can see details at various distances. This assessment is typically performed using a standardized eye chart, such as the Snellen chart, where each letter on the chart represents a specific size that corresponds to visual acuity levels.

Evaluating clarity of vision is essential for diagnosing various eye conditions and ensuring that a patient has adequate vision to perform daily tasks, such as reading or driving. By determining how clearly a person can see, healthcare professionals can identify any potential vision problems that may need to be addressed, whether through corrective lenses, medical intervention, or other treatments.

In contrast, testing for depth perception, color vision, or eye muscle balance serves different objectives and does not specifically focus on the clarity of vision itself. These aspects are important in their own right but are considered separate components of a comprehensive eye examination.