Method for calibrating a head-mounted eye tracking device, the method comprising: all acquisition step (S3), during which eye data relating to the position of the eye of the wearer are acquired by the eye tracking device while having the wearer of the head-mounted eye tracking device look in a direction of reference with regard to the spectacle lens mount, an association step (S4) during which the eye data acquired during the acquisition step are associated with the gaze direction corresponding to the direction of reference, a recording step (S5), during which the associated eye data and the gaze direction are recorded—wherein the head-mounted mounted eye tracking device comprises a spectacle frame in which ophthalmic lenses are mounted and the gazing direction corresponding to the direction of reference is determined based on the dioptric function of the ophthalmic lenses.