| 摘要 |
PURPOSE:To widen the long-distance/short-distance visual field of a pair of long-distance/short-distance spectacles by providing bearing parts which have longitudinal holes inside of a left and a right frame opposite to each other, and attaching a couple of pads which are coupled by a gate-shaped member thereto vertically slidably. CONSTITUTION:The bearing parts 2 having the longitudinal holes are provided opposite to each other to the left and right frames 1 closely to the centers and the left and right pads 4 are coupled together by the gate-shaped member 3 and attached to the bearing parts 2 vertically slidably. When a couple of spectacles are put on with the pads 4 lifted as shown in a figure, long-distance lens parts 5 face the front of the eyes and boundary lines 7 are much lower than the visual field. When the couple of spectacles are put on with the pad 4 lowered, on the other hand, short-distance lens parts 6 face the front of the eyes and the boundary lines 7 move above the visual field. Consequently, the long-distance/short-distance visual field is obtained in nearly the entire visual field. |
