People knew about optical illusions in ancient times. These whimsical visuals, capable of giving birth to interesting pictures, have fascinated the minds of people for centuries. People still ask themselves about what they really know about optical illusions; if they are defects in our perception that need to be dealt with, or vice versa, the key to understanding and presenting information. The article under consideration reviews the above-mentioned two polar theses and makes an attempt to answer the question. The research of recent years in the field of medicine, physics, mathematics and computer science will be taken as a basis. We will also look at authors' work in areas such as art history, psychology and social sciences to understand the spheres and directions of influence of optical illusions. The relevance of this topic is based on the fact that in the modern world, working in the exact sciences, a considerable place is reserved for optical illusions, such seemingly inaccurate phenomena. As a result people can use optical illusions for their own benefit, for example, in the world of art or in new technologies for representing information.