The thesis will consist of a theoretical and an experimental part. The theoretical part will describe the beginning, origin and history of the development of geometric optical illusions. The paper will highlight some scientific experiments conducted to understand the principles on which geometric optical illusions work. The theoretical part will also contain an overview of the most famous mathematical models used to interpret geometric optical illusions. The perception of human vision will also be mentioned and how the human eye functions in general and how it interprets optical illusions. In the experimental part, a statistical analysis of the intensity of certain geometric optical illusions will be performed, that is the intensity of the influence of various factors on the geometric optical illusions themselves. The test samples will be originally designed in an adequate graphic program in digital form for the purpose of conducting the experiment. The design of the test specimens will contain different variations of geometric shapes and chromatic and achromatic influences on the intensity of perception of geometric optical illusions. Data will be obtained using a visual experiment to be conducted on subjects unfamiliar with optical illusions from different age groups. The obtained results will be statistically analyzed in detail in the software package Statistica 12. The aim of the thesis is the statistical analysis of the obtained results to assess the intensity of certain geometric optical illusions depending on different parameters.