Abstract: The invention relates to an optical stylus (10) for an optical position determination device (1) comprising a position-encoded surface (50) having different position-encoding patterns (52). The optical stylus (10) comprises a housing (12) including: an image sensor (20) for capturing at least one image of any position-encoding pattern (52) of the position-encoded surface (50); an optical arrangement (15) comprising a dynamic optical element (16) configured to be electrically actuated in order to adjust the focal length of the optical stylus (10) as a function of a separation distance (D) between a reference point of the optical stylus (10) and the position of any position-encoding pattern (52) to have a substantially in-focus position-encoding pattern (52) corresponding to the position of the optical stylus (10), and a control unit (24) to control the dynamical optical element (16). The optical stylus further comprises a distance measurement sensor (32) to measure the separation distance (D).