By default, the screen reader searches the form settings for screen reader text in the following order: Custom Text, Tool Tip, Caption, and Name. You can override this default order using the Screen Reader Precedence option.
For example, if you want the screen reader to read the name instead of the caption, select Name. This also changes the search order to Name, Custom Text, Tool Tip, and then Caption.
See also 

To specify a different search order for screen reader text