An eye-tracking apparatus (400, 500, 600, 700, 800) comprising: - at least one lens (102, 202, 402, 502, 602, 702, 802) per eye, wherein a first surface of the at least one lens is to face a user's eye when the eye-tracking apparatus is worn by the user; - a frame (404, 504, 604, 704, 804) employed to hold the at least one lens; - at least one light source (106, 206, 406, 506, 606, 706, 806) arranged along a periphery (104, 204) of the first surface of the at least one lens; - a plurality of sensors (108a-d, 208a-b, 408a-b, 508a-b, 608a-b, 708a-b, 808a-b) arranged along the periphery of the first surface of the at least one lens, wherein the at least one light source (106, 206, 406, 506, 606, 706, 806) and the plurality of sensors (108a-d, 208a-b, 408a-b, 508a-b, 608a-b, 708a-b, 808a-b) are arranged along the periphery (104, 204) of the first surface using an electrically-conductive adhesive, wherein connections to the at least one light source and to the plurality of sensors are provided by wires printed on the periphery of the first surface; and - a processor (110, 210, 410) coupled to the at least one light source and the plurality of sensors, the processor being configured to: - control the at least one light source to emit light towards the user's eye; - control the plurality of sensors to sense reflections of the light off a surface of the user's eye; and - process sensor data pertaining to the sensed reflections to determine a gaze direction of the user's eye. - at least one lens (102, 202, 402, 502, 602, 702, 802) per eye, wherein a first surface of the at least one lens is to face a user's eye when the eye-tracking apparatus is worn by the user; - a frame (404, 504, 604, 704, 804) employed to hold the at least one lens; - at least one light source (106, 206, 406, 506, 606, 706, 806) arranged along a periphery (104, 204) of the first surface of the at least one lens; - a plurality of sensors (108a-d, 208a-b, 408a-b, 508a-b, 608a-b, 708a-b, 808a-b) arranged along the periphery of the first surface of the at least one lens, wherein the at least one light source (106, 206, 406, 506, 606, 706, 806) and the plurality of sensors (108a-d, 208a-b, 408a-b, 508a-b, 608a-b, 708a-b, 808a-b) are arranged along the periphery (104, 204) of the first surface using an electrically-conductive adhesive, wherein connections to the at least one light source and to the plurality of sensors are provided by wires printed on the periphery of the first surface; and - a processor (110, 210, 410) coupled to the at least one light source and the plurality of sensors, the processor being configured to: - control the at least one light source to emit light towards the user's eye; - control the plurality of sensors to sense reflections of the light off a surface of the user's eye; and - process sensor data pertaining to the sensed reflections to determine a gaze direction of the user's eye. - control the at least one light source to emit light towards the user's eye; - control the plurality of sensors to sense reflections of the light off a surface of the user's eye; and - process sensor data pertaining to the sensed reflections to determine a gaze direction of the user's eye.