| 摘要 |
PURPOSE: To individually and highly accurately suit user's build and each using purpose and to guarantee high protection by fixing the side part of a visual field plate to the under cut of a frame and sliding and fitting a holding part. CONSTITUTION: A glass plate 1 has a projection part 4 on its side part in the extending direction of the plate face. When the plate 1 is attached to the frame, the projection part 4 is engaged with the under cut 6 on the rear part of an extension part 5 of the frame 2. The holding part 25 has two extension parts 26. A nose pad 27 is formed on the rear face of the extension parts 26. A U-shaped lock part 28 formed on the upper face of the extension parts 26 has a front plate 29 and a rear plate 30. When the holding part 25 is slided and fitted to the frame 2, the front plate 29 is overlapped to the front face of the plate 1 and the rear plate 30 is overlapped to the rear face of a nose bridge 35. |
