what is the best reason for the use of parentheses in the following quotation from the unknown citizen

The best reason for using parentheses in the following line from "The Unknown Citizen" is to provide additional information that is not essential to the main narrative or to clarify something for the reader:

"(Note the close-up photo, showing (what could be a cut) above the right eye.)"

In this example, the parentheses are used to draw attention to a specific detail in the photo that may not be immediately obvious to all readers. The additional information inside the parentheses serves to emphasize the significance of the detail and help the reader visualize the scene more clearly.