Optical tracking system includes a marker portion, the upper and results processing. Marker section comprises a first lens pattern and with specific information. A first and a second image-forming unit, each with the second lens and the third lens and the first and second imaging units.The processing unit is a pattern including a rotation transformation between the first coordinate conversion equation and the first pixel coordinates and a second pixel coordinate on the image of the pattern between a first pixel coordinate on the first image of on the coordinates and the pattern surface pattern of the pattern determining a pattern position marker portion from the second coordinate conversion equation between the coordinates on the second pixel of the second image on the coordinates and the pattern surface, and parts of the tracking markers by using the determined position marker portion. This makes it possible to accurately track section markers in a more simple and easy way.