Spectacles and method for determining the pupil center

An eye tracking spectacles comprising:

• a frame,
• the frame having at least one receiving opening for receiving a disk-like structure, and
• wherein the frame has a U-shaped portion, which is provided for arranging the spectacles on the nose of a human,
• said U-shaped portion has a right nose frame and a left nose frame and a bridge between the right nose frame and the left nose frame,
• wherein a right eye detection camera is arranged in a right nose part frame, and wherein a left eye detection camera is arranged in a left nose part frame,
• said spectacles further comprising a first earpiece and a second earpiece, wherein the left eye detection camera and the right eye detection camera are arranged in the corresponding nose part frame in a position with a Z coordinate referred to a Z axis of a Cartesian system in the range 3 mm Z 15 mm,
• said Cartesian system (X, Y, Z) being placed with its origin corresponding to a maximum of a concave front profile of the U-shaped portion of the spectacles and X axis of the Cartesian system is parallel to the lower profile of the earpieces, being the plane XZ of the Cartesian system the symmetry plane of the spectacles, and Z axis is directed downward, thus avoiding the risk to have eyelids, eyelashes, and cheekbones interferences considering also different nose shapes of different somatic traits of different ethnicities, during the detection of pupil center of a wearer when in use, and wherein the right eye detection camera and the left eye detection camera are oriented respect to the Z axis with an angle beta, wherein 17.5° beta 22.5° thus allowing the spectacles to detect the possible pupil centers of a wearer of different ethnicities.