Additional etiquette guidelines include the following:
Find a place to sit and talk if a person has decreased physical stamina and endurance, which is preferable to standing during the entire interaction.
Place yourself at eye level with the person when conversing. Some ways to accomplish this without drawing attention to yourself are sitting on a chair or standing a little farther away to reduce the steep angle of the sightline. This is effective when interacting with all people who are sitting as well as persons with short stature.
Talk directly to the person with the disability, not to a person who accompanies them. Doing otherwise implies that you doubt their ability to understand.
Disability Etiquette Job Aid