Final answer:
The Snellen chart is used to assess visual acuity by asking patients to read lines of letters of decreasing size. A person's acuity is measured by the smallest line they can read, indicating their level of vision like 20/20 or 20/200.
It is true.
Step-by-step explanation:
The question relates to the use of the Snellen chart for testing visual acuity. To clarify the statement, the final step is not necessarily just reading the chart; instead, the process includes a test where the smallest line of letters that a person can read determines their visual acuity such as 20/20, which is normal vision. When a person with normal vision reads the chart, the smallest letters they should be able to read are on the line that subtends 5 minutes of an arc from 20 feet away. A person with 20/200 vision, for example, would be able to read from 20 feet what a person with normal vision could read from 200 feet.