What visual test determines the sharpness or clarity of vision?

The visual acuity test is specifically designed to measure the sharpness or clarity of vision. This test typically involves reading letters or symbols from a standardized chart at a specified distance, allowing for an assessment of how well a person can see details at varying distances. The results are often expressed as a fraction, with a higher number indicating better vision quality.

In contrast, the contrast sensitivity test evaluates the ability to discern between shades of gray and detect subtle differences in contrast, which can be important for understanding vision in low-light conditions. The peripheral vision test focuses on assessing the field of vision and can help identify issues related to side vision. Meanwhile, the color vision test examines the ability to perceive colors accurately, which is a different aspect of visual function altogether.

Each of these tests evaluates a different component of vision, but the visual acuity test specifically measures clarity, making it the correct choice in this context.