(1) Width of the frame: refers to the distance between the inside of the two temples, and the measurement position should be 25mm from the back of the lens ring on the inside of the two temples.

  (2) The opening angle of the temple: it is the angle between the normal of the temple and the plane of the mirror circle.

  (3) Length of temple bend point: the distance from the center of the temple hinge to the point on the ear.

  (4) Vertical length: the distance from the point on the ear to the end of the temple.

  (5) Vertical depression angle: the angle between the vertically long temple and the extension of the temple.

  (6) Vertical inner angle: the angle formed by the straight line between the inner side of the vertical long part and the plane perpendicular to the lens circle.

  (7) Joint and joint angle: The joint refers to the junction of the mirror ring and the temple; the joint angle refers to the angle between the vertical line of the mirror leg and the plane where the mirror ring is located. angle.