Pair of ophthalmic spectacles, comprising a frame and two eyeglasses (1, 2) held in the frame in order to be located in front of the eyes (100, 200) of a wearer of said spectacles, respectively, and allowing the wearer to see clearly through each eyeglass, the pair of spectacles comprising for each eyeglass: - at least one radiation source selected so that said radiation is reflected by the sclera and by the iris of each eye of the wearer with reflection intensity coefficients that are different for the sclera and for the iris, respectively; - at least one detector placed to measure the respective intensities of portions of the radiation produced by the source, which portions are respectively reflected in ocular zones in each of which there moves, during eye movements, a different segment of a limit between the sclera and the iris of the eye located behind said eyeglass; and - at least four radiation exit or entrance sections placed in the eyeglass, each exit section (10, 12, 20, 22) being placed to direct a portion of the radiation produced by the source toward at least one of said ocular zones, and each entrance section (11, 13, 21, 23) being placed to collect a portion of the radiation, which portion is reflected in one of said ocular zones; so as to form at least two radiation pathways each including a reflection, in one of the ocular zones in which the segments of the limit between the sclera and the iris of said eye move, from the eye of the wearer located behind said eyeglass; the pair of spectacles furthermore comprising means for separating the radiation portions transmitted between said at least one radiation source and said at least one detector by different radiation pathways, respectively; and the pair of spectacles furthermore comprising a processing unit suitable for characterizing a gaze direction of the wearer toward a point of observation, depending on the intensities simultaneously measured for the two eyeglasses, the pair of spectacles being characterized in that it comprises as many radiation exit sections (10, 12, 20, 22) as radiation entrance sections (11, 13, 21, 23) for each eyeglass, each of said exit sections being juxtaposed in the eyeglass with one of said entrance sections in order to form a separate radiation emission-reception pair corresponding to one of said radiation pathways, each emission-reception pair being placed in front of one of the ocular zones in which there moves, during eye movements, one of the segments of the limit between the sclera and the iris of the eye of the wearer located behind said eyeglass. - at least one radiation source selected so that said radiation is reflected by the sclera and by the iris of each eye of the wearer with reflection intensity coefficients that are different for the sclera and for the iris, respectively; - at least one detector placed to measure the respective intensities of portions of the radiation produced by the source, which portions are respectively reflected in ocular zones in each of which there moves, during eye movements, a different segment of a limit between the sclera and the iris of the eye located behind said eyeglass; and - at least four radiation exit or entrance sections placed in the eyeglass, each exit section (10, 12, 20, 22) being placed to direct a portion of the radiation produced by the source toward at least one of said ocular zones, and each entrance section (11, 13, 21, 23) being placed to collect a portion of the radiation, which portion is reflected in one of said ocular zones;