Diseases of the human visual system occupy a significant part of the total number of illnesses. Exercising the motor muscles of the eyes is one of the most effective methods of combating certain diseases of the human visual system. The paper considers the concept of a mixed reality training system using a parallel mechanism for vision training tasks. The block diagram of the system is given, its main components are described (including input unit, control unit, reprojection unit, sensor unit), as well as the principle of its operation. The full-scale assembling of the parallel manipulator has been accomplished. Other mechanisms can also be used as a manipulator. The elements of such a system were tested, namely, the registration of depth information, segmentation of the significant planes, etc. Based on this, environmental modeling was carried out. The proposed concept of a mixed reality simulator can be widely applied in various medical institutions.