| 摘要 |
PROBLEM TO BE SOLVED: To decide the frame of spectacles so that the normal line of sight and the optical axis of a lens are aligned with each other or they have an optional designed specified angle in adjusting spectacles. SOLUTION: The position of the optical axis of the lens on lens shape is previously designated to satisfy the designing condition of the lens while keeping the optional designed specified angle with the normal line of sight, and a triangle formed by setting the normal line of sight, the arm of the frame of spectacles, and a part of a front frame as three sides is specified to satisfy the designation, then a wearer puts on the frame of spectacles in pleasant circumstances that the arm and a nose pad are adjusted. At such a time, a following line-of-sight deciding instrument is used. The instrument includes a transparent base plate having center display and 1st reference line display passing through the center display, a transparent rotating disk rotatably held concentrically with the center display of the base plate and having 2nd reference line display aligned with the 1st reference line display, a rotational angle measuring means provided on the base plate and the rotating disk and measuring relative rotational amount, and a laser beam emitting means attached to one end side of the 2nd reference line display of the rotating disk. COPYRIGHT: (C)2005,JPO&NCIPI
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