| 摘要 |
The clip-on lenses (4, 5) are connected to a front bar (1) via two shorter bars (2, 3), to which they are attached by nylon lines (6, 7) which allow them to adapt precisely to the spectacle frame. Four metal hooks (8, 9, 10, 11) fixed to the edges of the lenses connect them to the spectacle frame, and the distance between the lenses can be adjusted by means of a bush (12) and screw.
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