Optical illusion personality tests use images with multiple elements to reveal hidden personality traits and desires based on what individuals notice first. This popular activity on social media is entertaining but offers generic results, so it should be taken lightly and shared for fun learning about oneself and others.Optical illusion personality tests use images with multiple elements to reveal hidden personality traits and desires based on what individuals notice first. This popular activity on social media is entertaining but offers generic results, so it should be taken lightly and shared for fun learning about oneself and others.