| 摘要 |
PROBLEM TO BE SOLVED: To provide a spectacles which allows even an amateur to perform attachment and removal of lens easily, applies no unreasonable stress to the lens and prevents lens breakage. SOLUTION: The lens 1 is directly attached to a transition 2 which is disposed on a front part, a pin hole 6 which is formed by piercing the inside of lens is fitted to a pin 11 disposed on a central part 9 of the transition, an L- shaped key 12 which is disposed on the transition 2 is restrained in a notched groove 8 formed on the upper margin 7 of lens and a backing plate 17 is attached to the rear side of the central part via a magnet 10.
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