Final answer:
The patient should stand 20 feet away from the vision chart for a distance visual examination.
Step-by-step explanation:
When performing a distance visual examination, a patient should stand 20 feet away from the vision chart. This is the standard distance used in optometry offices for testing visual acuity. The Snellen chart, which presents standard Roman letters in a variety of sizes, is commonly used for this purpose. By standing at the designated distance, the patient can accurately assess their ability to see the letters on the chart.