The Visual Acuity test is an assessment of distance vision. There are two tests: Visual Acuity Ages 3–7 and Visual Acuity Ages 8+. Participants are asked to sit 3 meters (9.8 feet) from the iPad and verbally identify the letters that appear on the screen. Younger participants may choose to point to the same letter on a card in front of them instead of saying the letters verbally. Different sets of optotypes (letters) are used for children and adults. This card is available for free download after you sign in on https://resources.nihtoolbox.org/.