Background: Myopia is labeled as one of the most common eye disorders, one of the most effective methods of its treatment being orthokeratological treatment. According to UNESCO, approximately 1.37 billion children in more than 130 countries globally are at risk of progressing myopia. Material and methods: Our study aimed to determine the efficiency of the othokeratological treatment in 120 patients (240 eyes) who wore OK lenses over 3 years. 40 patients (80 eyes) wore OK lenses uninterrupted; another 40 patients interrupted orthokeratological treatment for 3 to 6 consecutive months in the third year and another 40 patients worn OK lenses intermittently, on average at least 3 nights per week, in the third year of surveillance. All groups were divided according to the degree of myopia (mild or moderate), age (6-17 years and 17-19 years) and the presence or absence of familial factor. Results: Obtained data showed that the difference between the groups manifested in the third year of the study. In the group with mild myopia and 7-16 years of age who interrupted OK, the annual gradient of myopia progression increased statistically significant up to 69.5% from initial value, compared to the patients who applied OK intermittently and uninterrupted in the third year, this index was equal to 15.3% and 5% of the initial value, respectively, with a statistically significant difference (p<0,001). Also, in cases of discontinued wearing of OK lenses, the annual gradient of myopia progression increased significantly more in the group having a familial factor. In the group with mild myopia and 17-19 years, the annual gradient of myopia progression was 33.3% in the group who interrupted OK lenses, compared with 10.5% and 3.4% in the group who applied OK lenses intermittently and uninterrupted, respectively, with a statistically significant difference (p<0,001). Questioning the patients shows a high level of visual and psychological comfort in the groups which applied OK lenses continuously (99.6 points) and significantly less points (60.0 points) in the group who discontinued OK lenses. Conclusions. The results of the study showed that discontinued wearing of OK lenses leads to an increase in the annual gradient of progression of myopia. We would expect progression to decrease with time naturally, but this 'rebound' effect led to the conclusion that OK should not be ceased before age 16.