What does a visual acuity test primarily measure?

A visual acuity test primarily measures the clarity or sharpness of vision, reflecting how well an individual can see at various distances. This measurement is essential in determining the effectiveness of a person's vision and can identify issues such as nearsightedness (myopia), farsightedness (hyperopia), and other visual impairments. The test typically involves reading letters or symbols from a standardized chart, which provides a clear benchmark for visual performance.

This assessment is crucial for determining the need for corrective lenses or further eye evaluations, as precise visual acuity is fundamental for various daily tasks, including reading, driving, and other activities requiring sharp vision. By establishing a clear understanding of visual acuity, eye care professionals can make informed decisions about the best course of action for their patients' eye health needs.