An optical tracker and a surgical device. The surgical device includes a shaft defining a longitudinal axis. The shaft has a first shaft portion configured to be inserted into a patient, and a second shaft portion configured to be located outside the patient when the first shaft portion is inserted in the patient. The surgical device further includes an actuation member actuatable relative to the first shaft portion, and an operation member operable relative to the second shaft portion. The operation member is configured to actuate the actuation member when being operated. Further, the surgical device includes a tracker coupled with the operation member so that operation of the operation member causes the tracker to move relative to the shaft, such as to rotate around the longitudinal axis.