Vision tests are assessments used to evaluate a person's eyesight and overall eye health. These tests can measure various aspects of vision, including clarity, color perception, and depth perception. Common methods include reading letters from a chart, using specialized equipment, and checking how well the eyes work together. Regular vision tests are important for detecting issues like nearsightedness, farsightedness, and astigmatism. They are typically performed by eye care professionals, such as optometrists or ophthalmologists, and can help determine the need for corrective lenses or other treatments to maintain good vision.