Final answer:
Reading acuity tests use a Snellen chart at a distance of 20 feet, with both eyes open, to determine visual acuity, such as 20/60 vision.
Step-by-step explanation:
A reading acuity test is typically performed using a Snellen chart, which is a visual aid with rows of letters decreasing in size. This test is conducted with both eyes open and from a standard distance of 20 feet away. The smallest line of letters a person can read determines their visual acuity.
For example, 20/60 vision means the smallest letters that can be read at 20 feet by the person being tested can be seen by a person with normal vision at 60 feet. Understanding visual acuity is crucial for diagnosing vision capabilities and eye health.