Camera Lucida is a device used in the past for drawing or painting. It works by reflecting an image on a piece of paper or canvas that the artist can then trace or copy. However, there are also a few synonyms for the term camera lucida. These include the optical device, drawing aid, drawing tool, and artists' tool. Essentially, these synonyms refer to the same device with different names used in different contexts. Regardless of what it's called, the camera lucida has been a valuable tool for artists for centuries, and continues to be used by many today.