No. 930:
Putting for dual-use eyeglasses.
Because the pad moves 5 mm up and down, the nearby is easy to see! Because the shape of the putt is V-shaped, it vertically moves up and down, the nose width is difficult to change.
Lowering the pad raises the eyeglasses and the near portion of the lens approaches the eyes, so you can clearly see the characters at hand.
There are 2 types of screw type and one touch type.