| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to position the lens parts to be used at an adequate height and adequate angle in either case of a far sight and near point sight with bifocal spectacles. SOLUTION: The rear end sides of supporting pieces 2 respectively mounted with front ends at the respective outer sides of right and left spectacle frames 1 and the front end sides of temples 3 are connected to each other via connecting means adapted in such a manner that the supporting pieces 2 are rotatable vertically with respect to the temples 3 between the rear end side of the supporting pieces 2 and the front end sides of the temples 3 and that the supporting pieces 2 retreat slightly when the supporting pieces 2 are rotated downward with respect to the temples 3. The spectacle frames 1 are made perpendicular or slightly oblique forward with respect to the temples 3 and the distances between the spectacle frames 1 and the bow side ends 4 are made slightly shorter when the spectacle frames are tilted forward. When the spectacle frames 1 are set perpendicular, the state of the far sight is attained and when the spectacles are tilted, the spectacle frames 1 are slightly lifted and the lens parts of near points attain the height and angle suitable for the near point sight.
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