Abstract: A quick-replacement structure of glasses lenses comprises an upper frame, a lower frame, and a fastener. The upper frame comprises a groove at the middle part, and a slot formed at the bottom of the groove and forwardly penetrating the frame wall. The lower frame comprises an insert upwardly extended from a middle section and a hole in the insert. The fastener is corresponded to the groove shape, and an inserted pin is forwardly extended from the fastener wall. When the both ends of the upper frame and the lower frame are hinged on each other, the insert of the lower frame is inserted into an upper lens recess, and the hole in the insert is corresponded to the slot of the groove, then the inserted pin of the fastener is through the slot and the hole, quickly clamping the lenses between the upper frame and the lower frame.

Abstract: Provided is a technique that makes it possible to carry out more accurately alignment of a device optical system by a simpler method in measuring an optical characteristic at an anterior ocular segment of an eye of examinee's by an ophthalmic measurement device. In measuring an optical characteristic at an anterior ocular segment of an eye (A) of examinee's, an adjustment of positional relationship between the eye (A) of examinee's and a measurement optical system is carried out by utilizing reflection lights (B, C, D), i.e., the light (B) generated by reflection of the irradiated light from the infrared L.E.D. (11) at the cornea, the light (C) generated by reflection of the laser light (E) from a laser light source at the cornea, and the light (D) generated by reflection of the laser light (E) from the laser light source at the crystalline lens.

Abstract: A lens driving device comprises a lens holder for holding a lens, a shaft for supporting the lens holder so as to make the lens holder movable in an optical axis direction of the lens and swingable about an axis of the shaft, an actuator for applying a driving force to the lens holder so as to move the lens holder in the optical axis direction; and an urging member for applying an urging force to the lens holder so as to rotate the lens holder toward the actuator. In the lens holder, a position where the urging force is applied by the urging member and a position where the driving force is applied by the actuator oppose each other, so that the urging force from the urging member is directed to the actuator.

Abstract: An objective lens is made up of a light-source-side lens and a medium-side lens wherein at least either one of rim portions of respective opposing surfaces of the light-source-side lens and the medium-side lens forms a rise-up section projected towards the other lens, the rim portion which forms the rise-up section and the rim portion of the other lens at least partially contact one another, and these two lens are fixed together by an adhesive resin layer formed in a spacing between the respective rim portions. With the foregoing structure, an objective lens made up of a pair of lenses which has high rigidity as a whole and is capable of high speed recording and reproducing by suppressing adverse effects of resonance can be realized.