"Twenty twenty vision" refers to the ability to see clearly at a distance of 20 feet. However, there are many synonyms for this term, such as perfect eyesight, sharp vision, clear vision, excellent visual acuity, and keen eyesight. Each of these synonyms points to the same condition of having healthy and highly functional eyes. People with 20/20 vision are often able to read small letters on a chart from a distance, have better depth perception, and can distinguish between colors and contrast. It's essential to maintain good eye health and get regular eye check-ups to ensure that one's vision remains clear and accurate.